Accounts of Caliph Al-Ma'mun's forced entry into the Great Pyramid (c. 832 AD) report interior chamber walls coated with a layer of salt.

Untraced secondary report; the archival project (GEO-R001) is the highest information-per-dollar item on the agenda.

The historical anchor regarding a salt layer found by Al-Ma'mun's party survives only as a secondary report circulating within proponent materials. It has yet to be traced to verified primary Arabic manuscripts. The strongest opposing consideration is that even if verified, salt accumulation frequently occurs naturally in structures via mortar efflorescence or groundwater wicking.

The salt‑layer story currently rests on a Geopolymer Institute secondary account and Davidovits’ informal “taste tests” (GEO‑E004), with no confirmed citation to primary Arabic chronicles or systematic physico‑chemical documentation of salts in situ. Without tracing the original texts and distinguishing ancient efflorescence from modern contamination or mortar leaching, the historical claim is unverified. The strongest opposing consideration is that salt deposits inside a pyramid have several mundane explanations (groundwater, mortar efflorescence, visitor impact), so even if the report were authenticated it would not uniquely indicate natron‑rich cast stone.

The salt-layer report circulates through the Geopolymer Institute and Fóti and has not been traced to Al-Maqrīzī, Ibn Khaldūn, Al-Idrīsī, or any other primary Arabic compilation; Davidovits' own taste tests of fragments are not a historical source. Even a verified ninth-century report would still face mundane explanations such as mortar efflorescence or groundwater wicking. The strongest opposing consideration is that a sealed monument growing a centimeter-scale salt coat is, if the account is real, more naturally predicted by natron-bearing wet-set stone than by dry quarried limestone — which is why the archival check is high-leverage.

The salt-layer report circulates only through proponent channels (GEO-E004) and has never been traced to primary Arabic sources — tracing it is the explicit purpose of the cheapest project on the agenda (GEO-R001). Even if verified, mundane mechanisms (mortar efflorescence, groundwater wicking) cap its diagnosticity, but as the historical anchor of the natron reading its current state is hearsay either way. The strongest opposing consideration is transmission risk: a ninth-century event surviving through later compilations may be embellishment or mistranslation, and proponent taste-tests of fragments recorded in the same source are no substitute for the archive. Unresolved, substantively so: this is verifiable archival work that nobody has done.

The claim is textual — that ninth-century accounts report salt-coated chamber walls — and the only record supporting it (GEO-E004) is a proponent organization's secondary retelling that has never been traced to Al-Maqrīzī, Ibn Khaldūn, Al-Idrīsī or any primary Arabic compilation. Until that tracing is done there is literally nothing to weigh, and the accompanying detail (Davidovits' own repeated taste tests) is self-reported by the hypothesis's proponent. The strongest opposing consideration is that even a verified account would be weakly diagnostic, since efflorescence from mortar, groundwater wicking, and centuries of visitor and animal traffic are ordinary sources of interior salt in a limestone structure. Confidence is high that the claim is currently unresolvable on this record, and it is the cheapest item on the agenda to settle.

Unchanged: untraced secondary report from the proponent organization (GEO-E004) with mundane alternative explanations for interior salt; the archival trace remains the cheap decisive test.

Unchanged: an untraced secondary report relayed by the proponent organisation (GEO-E004), with mundane alternatives for interior salt. Tracing the primary Arabic sources remains the cheap decisive test.

An untraced secondary report relayed by the proponent organisation (GEO-E004), with mundane candidate origins for interior salt such as efflorescence or groundwater wicking. Tracing the primary Arabic sources remains the decisive cheap test.

Proponent literature relies on secondary reports that Al-Ma'mun's 820 AD expedition found chamber walls coated in a thick salt layer, implying wet-cast natron chemistry. The strongest opposing consideration is that this historical anchor has never been traced to primary Arabic sources, and even if verified, mundane phenomena like mortar efflorescence or groundwater wicking readily explain salt deposits.

The salt-coated-chamber account is currently supported only by secondary reporting from the Geopolymer Institute and Fóti (GEO-E004), and has not been traced to primary Arabic chronicles or critically edited texts. Until such sources are located and evaluated, we cannot know whether the description is accurate, embellished, or absent. The strongest opposing consideration is that, even if a salt layer were historically attested, there are mundane alternative mechanisms such as mortar efflorescence, groundwater wicking, and later human activity that could explain it without invoking cast stone.

The salt-layer report circulates through the Geopolymer Institute and Fóti and has not been traced to primary Arabic sources; Davidovits' own taste tests of fragments are proponent observations with obvious contamination routes. A sealed limestone monument growing a centimeter-scale salt coat would be easier to explain if natron were in the mix, but salt also has mundane sources in mortar efflorescence and groundwater wicking. The strongest opposing consideration is that a ninth-century episode surviving only through later compilations may be embellishment or mistranslation, which is why the archival trace is the cheapest decisive project on this claim.

The salt-layer report circulates only through proponent channels (GEO-E004) and has never been traced to the primary Arabic sources (Al-Maqrīzī, Ibn Khaldūn, Al-Idrīsī), which is precisely the proposed archival project GEO-R001. On the source side the strongest opposing consideration is that a ninth-century report surviving through later compilations may be embellishment or mistranslation; on the interpretation side, even a verified report has mundane candidate explanations (mortar efflorescence, groundwater wicking), so verification alone would not be decisive. Davidovits' taste tests are proponent self-report and add no independent weight. Cheap, falsifiable in both directions, and currently empty: unresolved.

The claim concerns what the medieval accounts report, and even that has never been traced to primary Arabic sources; the file's only record (GEO-E004) is a proponent organization's secondary retelling bundled with Davidovits' own taste tests, which carry no evidentiary weight. The Al-Ma'mun entry narratives are transmitted through later compilations known for embellishment, so the transmission chain must be checked before the observation can be used at all. The strongest opposing consideration for treating it as promising is that a genuine ninth-century eyewitness description of thick salt would be a real datum — but salt in Egyptian monuments has mundane origins (groundwater wicking, mortar efflorescence, guano, later visitor traffic), so verification alone would not be diagnostic for casting. This is the cheapest project on the agenda and remains undone.

Untraced secondary report relayed by the proponent organisation (GEO-E004), with mundane candidate origins for interior salt. Tracing the primary Arabic sources remains the cheap decisive test.

An untraced secondary report relayed by the proponent organisation (GEO-E004), with mundane candidate origins for interior salt. Tracing the primary Arabic sources remains the cheap decisive test.

Direct examination of al-Suyūṭī's medieval compilation of Arabic accounts regarding al-Ma'mun's breach (GEO-E027) details the fire, vinegar, iron tools, and internal discoveries, but makes no mention of salt or halite crusts on the chamber walls. The claim is traceable only to an uncited assertion on a modern proponent website (GEO-E004, GEO-E029). Strongest opposing consideration: Al-Suyūṭī was a 15th-century compiler, leaving open the remote possibility that an unconsulted earlier Arabic text (such as unedited recensions of al-Maqrīzī) contains an overlooked reference to salt encrustations.

The salt report's only carrier is an uncited statement on a proponent web page dated to the wrong year (832, not 820, per Nemoy's dating of al-Maʾmūn's arrival), and the principal medieval Arabic compilation of the breach (al-Suyūṭī via Nemoy) describes the entry and its finds in detail without any mention of salt. The strongest opposing consideration is that other Arabic sources (al-Maqrīzī's Khiṭaṭ, ʿAbd al-Laṭīf) remain unread, so this is negative evidence from one compilation — but the burden now sits with whoever asserts the report, and the geologically expected halite (GEO-C906, GEO-E032) removes its evidential interest regardless.

The ledger's only carrier of the salt-layer report is an uncited proponent webpage (GEO-E029), the principal medieval compilation lacks any salt mention (GEO-E027), and the date is wrong (GEO-E028). The strongest opposing consideration: al-Suyūṭī is one compilation and other Arabic sources remain unread (GEO-R001), so absence is not yet exhaustive — the report survives as an untraced assertion, not as attested history.

The salt-layer story is supported only by an uncited proponent webpage, while GEO-E027 finds no salt in the principal al-Maʾmūn breach narratives contained in the Arabic compilation examined. GEO-E028 also places the documented Egyptian visit in 832 rather than the stated circa-820 date, and GEO-E029 confirms that the proponent page names no medieval source. The strongest opposing consideration is that several other Arabic works remain unread, so a presently untraced account could still contain the report.

The only affirmative carrier, GEO-E004/GEO-E029, is an uncited proponent webpage rather than a traceable medieval account. GEO-E027 examines two al-Ma'mun entries and another related notice in a major Arabic compilation and finds detailed descriptions of the breach and finds but no salt coating; GEO-E028 also corrects the associated date toward 832. The strongest opposing consideration is that not every relevant Arabic source has been examined, so an untraced account could still exist.

The claim asserts that accounts of al-Ma’mūn’s entry report salt-coated interior walls. The only ledger carrier is an uncited Geopolymer Institute webpage (dating the event to 820). Nemoy’s translation of al-Suyūṭī’s compilation recounts the breach twice with finds (walls, well, sarcophagus, rope) and never mentions salt; Nemoy dates the caliph’s Egyptian stay to 832, not 820. Other medieval sources remain unchecked, but the burden to name a primary author has not been met. Strongest opposing consideration: a still-unread passage in al-Maqrīzī, ʿAbd al-Laṭīf, or Vyse’s Arabic extracts could yet surface the salt report.

The salt-layer report is carried solely by an uncited proponent webpage dating the event to 820; al-Suyūṭī's compilation of the principal medieval accounts of al-Maʾmūn's breach (Nemoy 1939) describes the opening, finds, and chambers in detail yet mentions no salt, halite, or wall coating, and Nemoy dates the Egyptian stay to 832. Strongest opposing consideration is that other unread Arabic sources (full Maqrīzī, ʿAbd al-Laṭīf, Vyse extracts) might still contain the detail.

The claim asserts that accounts report salt-coated chamber walls, yet the only carrier in the ledger is an uncited proponent web page that also misdates the breach to 820 when the translator's note places the caliph in Egypt in 217/832. Al-Suyūṭī's compilation, which gathers the principal medieval Arabic accounts of the breach and describes the finds in detail down to worn pieces of rope, mentions no salt in any of its three treatments. The strongest opposing consideration is that this is negative evidence from one compilation: al-Maqrīzī's full Khiṭaṭ chapter, ʿAbd al-Laṭīf al-Baghdādī, and the Vyse extracts remain unread, so a source could still surface. Until one does, the assertion has no traceable anchor.

The ledger's only carrier of the salt-layer report is an uncited proponent web page that also misdates the breach to 820 rather than 832 (GEO-E029, GEO-E028), and al-Suyūṭī's compilation of the principal medieval Arabic accounts describes the breach and its finds in detail with no mention of salt or any wall coating (GEO-E027). Confidence is low because this is absence within one compilation: al-Maqrīzī's full Khiṭaṭ chapter, ʿAbd al-Laṭīf and the Vyse extracts remain unread under GEO-R001. The strongest opposing consideration is exactly that unread remainder — a single located passage would flip this verdict.

GEO-E004 is the only record: the proponent institute's page recounts the report and Davidovits' own taste tests, and the primary Arabic sources remain untraced in this ledger. The claim is about what medieval accounts report; without a medieval author the ledger cannot say whether the report exists. Salt, if present, has mundane candidate origins.

The only support is GEO-E004 (weak; a proponent web page). GEO-E029 (moderate) shows that page names no medieval author, work or manuscript. GEO-E027 (moderate) shows al-Suyūṭī's compilation of the breach accounts — fire, vinegar, iron, catapults, a twenty-cubit wall, a jar of dinars, a well, a black quartz shaft, a granite basin with worn rope — mentions no salt. GEO-E028 dates the caliph's Egyptian visit to 832, not the claim's 820. Other Arabic authors remain unread, so not yet a provenance failure; but the burden has moved to whoever asserts the report.

The report circulates through proponent literature (Geopolymer Institute, Fóti); it has never been traced to primary Arabic sources — which is precisely the proposed research project.

A detailed examination of al-Suyūṭī's 15th-century compilation of medieval Arabic accounts of al-Maʾmūn's breach (translated by Nemoy 1939) reveals no mention of a salt layer or halite incrustation, recording only structural dimensions, mummy finds, ropes, and empty basins. The claim that medieval breach records document an original salt coating originated on proponent websites without citation to primary Arabic texts. The strongest opposing consideration is that other medieval Arabic manuscripts (such as untranslated portions of al-Maqrīzī or al-Baghdādī) have not been exhaustively audited in the current evidence ledger.

The claim that Caliph Al-Ma'mun's party reported salt-coated walls stems solely from uncited secondary proponent claims (GEO-E004, GEO-E029). Examination of Al-Suyūṭī's compilation of primary medieval Arabic accounts of Al-Ma'mun's breach (GEO-E027) details the breakthrough, tools, and chamber finds but makes no mention of salt or coatings. The strongest opposing consideration is that other unexamined medieval Arabic manuscripts (such as Al-Maqrīzī's full text or Vyse's extracts) might preserve an independent variant narrative containing the salt detail.

Al-Suyūṭī's compilation (Nemoy 1939), which gathers the principal medieval Arabic accounts of Caliph Al-Ma'mun's entry into the Great Pyramid, describes the breach and internal chambers in detail but makes no mention whatsoever of a salt layer coating the walls. The salt report traces entirely to an uncited assertion on a modern proponent webpage. The strongest opposing consideration is that other medieval Arabic chronicles, such as al-Maqrīzī's Khiṭaṭ or al-Baghdādī, have not yet been exhaustively checked in the primary Arabic text.

Primary medieval Arabic accounts of Al-Ma'mun's entry into the Great Pyramid (compiled by al-Suyūṭī and translated by Nemoy 1939) recount the forced breach, iron tools, fires, and discoveries of artifacts and corpses, but make no mention of chamber walls coated in a layer of salt. The specific narrative of an interior 1.5 cm thick salt encrustation originates in modern proponent literature (Geopolymer Institute) without primary citations. The strongest opposing consideration is that unexamined Arabic chronicles (such as al-Maqrīzī's full Khiṭaṭ or ʿAbd al-Laṭīf al-Baghdādī) might contain an uncited reference to wall efflorescence.

The salt-layer report's only carrier in the ledger is an uncited statement on a proponent web page, dated to the wrong year (820 vs Nemoy's 832), and the principal medieval compilation of the breach (al-Suyūṭī via Nemoy) describes the entry in detail twice without any mention of salt. That is negative evidence within one compilation, not proof no Arabic source says it — al-Maqrīzī's full Khiṭaṭ remains unread — so the report survives only as an unanchored claim whose burden now sits with its asserters.

The ledger's only carrier of the salt report is an uncited statement on a proponent webpage dated to the wrong year (820 vs 832), while al-Suyūṭī's compilation — which records the breach in detail across multiple authorities, including the finds behind the breach — never mentions salt. The weight of the record now runs against the report's attested existence; confidence stays low only because other medieval Arabic sources (al-Maqrīzī's Khiṭaṭ, ʿAbd al-Laṭīf, Vyse's extracts) remain unread.

This round of work hit the claim hard: the only carrier is an uncited proponent webpage dated to the wrong year (GEO-E028, GEO-E029), and the principal medieval Arabic compilation of the breach — al-Suyūṭī via Nemoy — describes the breach and its finds in detail without any mention of salt (GEO-E027). This is negative evidence within one compilation, not proof no Arabic source says it (GEO-R001 remains open), but the burden has flipped: an asserted historical report now has no traceable anchor. Contradicted is warranted for the claim as an attested account.

The salt report currently has no traceable medieval anchor: the only carrier is an uncited proponent webpage with the wrong date (GEO-E029, GEO-E028), and al-Suyūṭī's compilation of the breach accounts contains no salt mention (GEO-E027). This is unresolved rather than contradicted only because al-Maqrīzī's Khiṭaṭ, ʿAbd al-Laṭīf, and Vyse's Arabic extracts remain unread — the absence within one compilation is negative evidence, not demonstration. The strongest opposing consideration is that the compilation is a 15th-century digest, not a contemporary witness, so silence there cannot settle what earlier authors wrote.

GEO-E004 traces the salt-layer story only to an unreferenced proponent account, and GEO-E029 confirms that the page names no medieval author or text. GEO-E027 finds no salt in the examined compilation's two al-Ma'mun narratives despite their detailed descriptions of the breach and finds, while GEO-E028 corrects the associated date toward 832. The strongest opposing consideration is that several other medieval Arabic works remain unread, so an account could still be located. On the evidence actually supplied, however, the asserted historical report has no traceable anchor and the checked narratives contradict its current presentation.

The affirmative record is an uncited proponent webpage, while GEO-E027 finds no salt coating in the principal al-Ma'mun narratives collected by al-Suyuti and GEO-E029 confirms that the webpage names no medieval source. GEO-E028 also corrects the associated Egyptian visit from 820 to approximately 832, although the claim now uses the latter date. The strongest opposing consideration is that several potentially relevant Arabic works remain unread, so a currently untraced salt report could still exist.

The sole affirmative basis, GEO-E004 and GEO-E029, is an uncited proponent webpage asserting a 1.5-centimetre salt layer and giving an unsupported 820 date. GEO-E027 finds no salt in the principal al-Ma'mun breach narratives collected by al-Suyuti, while GEO-E028 instead places the relevant Egyptian visit in 832. The strongest opposing consideration is that not every potentially relevant medieval Arabic source has been checked, so absence from one compilation cannot prove that no such report exists. On the present evidence, however, the claimed historical report lacks a traceable account and is contradicted by the examined narrative record.

The only affirmative record is an uncited proponent webpage, while GEO-E027 finds no salt reference in the examined compilation's two al-Ma'mun breach accounts. GEO-E028 also corrects the associated date from the asserted 820 to an Egyptian visit in 832, and GEO-E029 confirms that no medieval source is named. The strongest opposing consideration is that only one later compilation has been searched, so an unexamined Arabic source could still contain the report.

The sole positive carrier is an uncited statement on the Geopolymer Institute page dating the event to 820 AD; al-Suyūṭī's compilation of the principal medieval Arabic accounts of al-Maʾmūn's breach (Nemoy 1939) describes the opening, finds and chambers in two entries plus a third mention yet contains no reference to salt, halite or wall coatings. Nemoy dates the Egyptian stay to 832. Strongest opposing consideration is that other unread Arabic sources (full Maqrīzī, ʿAbd al-Laṭīf, Vyse extracts) might still contain the report.

The salt-layer report is carried solely by an uncited Geopolymer Institute web page dating the event to 820 AD. Al-Suyūṭī’s compilation of the principal medieval accounts (Nemoy 1939) describes the breach and finds in detail yet never mentions salt or any wall coating; Nemoy dates the caliph’s Egyptian stay to 832. Mundane sources of NaCl are abundant. Strongest opposing consideration is that some still-unread Arabic source might yet contain the report.

The only ledger carrier of a 1.5 cm salt-coat report from Al-Ma’mun’s entry is an uncited Geopolymer Institute webpage dating the event to 820 AD. Al-Suyūṭī’s compilation of principal medieval accounts (Nemoy 1939) describes the breach and finds in detail without mentioning salt or wall coatings, and Nemoy dates the caliph’s Egyptian stay to 832. Other Arabic sources remain unchecked, so a hidden primary is possible, but the claim as currently evidenced fails. Strongest opposing consideration is residual unread sources (full Maqrīzī, ʿAbd al-Laṭīf, Vyse extracts) that GEO-R001 flags.

The ledger’s only affirmative carrier is an uncited Geopolymer Institute web page dating the breach to 820 and asserting a thick salt coat; Nemoy’s translation of al-Suyūṭī’s compilation of principal medieval accounts of al-Maʾmūn’s entry describes the breach and finds in detail and mentions no salt, while dating the Egyptian stay to 832. Strongest opposing consideration is incomplete coverage of all Arabic sources (al-Maqrīzī full Khiṭaṭ, ʿAbd al-Laṭīf, Vyse extracts still on GEO-R001), so a presently untraced passage could still exist — but the claim as currently evidenced fails.

The report's only carrier in this ledger is an uncited proponent web page (GEO-E029) that also misdates the event to 820 rather than 832 (GEO-E028), while al-Suyūṭī's compilation of the principal medieval Arabic accounts of the breach describes the finds in some detail and mentions no salt anywhere (GEO-E027). A claim about what historical accounts report is directly testable against those accounts, and the test available failed. Confidence is low, not moderate, because the negative is drawn from one 15th-century compilation: al-Maqrīzī's full Khiṭaṭ, ʿAbd al-Laṭīf, and the Vyse extracts remain unread (GEO-R001), and any one of them could carry the passage.

The ledger's only carrier of the salt-layer report is a proponent web page that names no author, work or manuscript and misdates the event to 820 rather than 832, while al-Suyūṭī's compilation of the principal medieval accounts of the breach describes the finds in detail and mentions no salt anywhere. That is meaningful negative evidence and shifts the burden decisively onto whoever asserts the report. I stop short of "contradicted" because the check is not exhaustive: al-Maqrīzī's full Khiṭaṭ, ʿAbd al-Laṭīf, and the Arabic extracts in Vyse remain unread, and GEO-R001 is the cheapest decisive item on the agenda.

The claim's only carrier is an uncited proponent web page that also misdates the event to 820 (GEO-E029, GEO-E028), while the principal medieval Arabic compilation of al-Ma'mun accounts describes the breach in detail — wall thickness, jar of dinars, sarcophagus, worn rope — and never mentions salt or any wall coating (GEO-E027). A widely repeated report with no nameable author, absent from the leading compilation, is best read as an artifact of proponent retelling. The strongest opposing consideration is that this is negative evidence within one compilation: al-Maqrīzī's full Khiṭaṭ, ʿAbd al-Laṭīf and the Vyse extracts remain unread, which is why confidence is low.

The salt-layer report enters the ledger only through a Geopolymer Institute web page that cites no author, work or manuscript and dates the entry to 820 AD, a date matching no source here; Nemoy places al-Ma'mun's Egyptian visit in 217/832. Al-Suyuti's compilation, which gathers the principal medieval Arabic accounts of the breach and describes the twenty-cubit wall, the granite basin with worn rope and the inscribed marble tablet, mentions no salt anywhere. The strongest opposing consideration, and the reason confidence is low rather than moderate, is that this is absence within one compilation: al-Maqrizi's full Khitat chapter, Abd al-Latif al-Baghdadi and the Vyse extracts remain unread (GEO-R001), so a single archival find could reverse this verdict cheaply.

The only affirmative carrier is an uncited proponent web page (GEO-E004, GEO-E029) that also misdates the breach to 820 against the translator's 832 (GEO-E028). GEO-E027 finds that al-Suyūṭī's compilation of the principal medieval accounts describes the breach twice in detail — fire, vinegar, tools, catapults, the twenty-cubit wall, the dinars, the well, the granite basin with worn rope — and mentions no salt or coating. The claim that the accounts report salt is therefore against the accounts that have been read. Confidence low because the absence is within one compilation; al-Maqrīzī's full chapter, ʿAbd al-Laṭīf and the Vyse extracts remain unread (GEO-R001).

GEO-E027: al-Suyūṭī's compilation gives two detailed accounts of the breach with no mention of salt; GEO-E029: the only carrier of the report is an uncited proponent page; GEO-E028: even its date is unsupported. GEO-E004 supports weakly. Confidence is low because other medieval authors remain unread.

GEO-E027 finds that al-Suyūṭī's two detailed entries on the breach mention no salt. GEO-E029 shows the report's only carrier is a proponent page citing no medieval source, and GEO-E028 shows its 820 date matches nothing shown. GEO-E004 is that same uncited report. Contradicted, with low confidence, because other medieval authors remain unread.

The ledger's only carrier of the salt report is an uncited proponent webpage dated to the wrong year, and the principal medieval compilation of the breach accounts (al-Suyūṭī via Nemoy) describes the entry in detail without ever mentioning salt. This is negative evidence within one compilation, not proof of absence — al-Maqrīzī's Khiṭaṭ and other Arabic sources remain unread — so the claim is unsettled with the burden now on its asserters.

The only affirmative carrier is an uncited proponent webpage that dates the breach to 820 and supplies no medieval author or work. GEO-E027 finds no salt in al-Suyūṭī's collected accounts of the breach, while GEO-E028 and GEO-E029 expose the dating and sourcing problems. The strongest opposing consideration is that the checked compilation is late and incomplete, so an unread medieval source could still contain the report.

The sole carrier is an uncited Geopolymer Institute webpage asserting a 1.5 cm salt layer found by al-Ma’mun in 820 (GEO-E004/E029). al-Suyūṭī’s compilation of the principal medieval accounts describes the breach in detail yet never mentions salt (GEO-E027); the date is also corrected to 832 (GEO-E028). Strongest opposing consideration is total absence of a traceable primary Arabic source.

The ledger's only carrier of the salt report is a proponent web page that names no author, work or manuscript and dates the event to 820 (GEO-E004, GEO-E029). Nemoy's note puts al-Maʾmūn's Egyptian stay in 217/832 (GEO-E028). Al-Suyūṭī's compilation gives the breach twice in circumstantial detail (fire, vinegar, iron tools, catapults, the wall's thickness, the finds) plus a third mention, and none mentions salt or any coating (GEO-E027). I read GEO-E027's "undermines" as correct; the recorded dissent appears to confuse the compilation's contents with the claim's. Strongest opposing consideration: this is absence from one fifteenth-century compilation, and al-Maqrīzī's full Khiṭaṭ chapter, ʿAbd al-Laṭīf al-Baghdādī and the Arabic extracts in Vyse remain unread (GEO-R001), so a primary source could still surface.

The only carrier of the report, GEO-E004, is a proponent page that GEO-E029 shows cites no medieval source and misdates the event. GEO-E027 finds no salt in al-Suyūṭī's detailed accounts of the breach, and GEO-E028 dates the caliph's arrival to 832. Other Arabic authors remain unread, so this is a strong negative within the main compilation, not proof of absence.