The Sinai Palimpsests Project (2011–2016) used multispectral imaging to recover 307 erased texts from scraped-and-reused parchment at St. Catherine's Monastery

palimpsestmultispectral-imagingsinaimanuscriptsdigital-humanitiespreservationquantitative-correction

A palimpsest is parchment that was scraped clean and overwritten to reuse a scarce material, leaving an earlier text erased but not fully gone. The Sinai Palimpsests Project (2011–2016), run by the Early Manuscripts Electronic Library, applied multispectral imaging — photographing pages under many wavelengths of light to separate the faint under-writing from the visible over-text — to the collection of St. Catherine's Monastery on Mount Sinai. The project's director, Michael B. Phelps, gives the definitive figures in his own 2023 peer-reviewed retrospective: spectral data were generated for "6,800 palimpsest pages, representing 74 palimpsest codices," yielding "identification of 307 discrete erased texts in 11 languages" — stated twice, in two separate sections of the same chapter, with the same numbers both times. Several of the recovered texts were in languages or versions not previously attested, including Syriac and Christian Palestinian Aramaic material.

The 305 figure once carried here came from EMEL's own institutional project page (still online, undated): "Based on these images, participating scholars identified 305 erased texts" — a figure since repeated in press and aggregator coverage. It does not survive contact with Phelps's later, more authoritative academic account, and no source located gives a reconciling footnote for the two-text gap. Two adjacent figures from the same project disagree across its own venues in the same direction — see claim-sinai-monastery-known-palimpsests-total-unsettled-160-vs-172 and claim-sinai-erased-text-language-count-unsettled-10-vs-11. The question that raised this check is now largely answered.

The project sits in the same technical lineage as virtual unwrapping and the reading of PHerc. 1667: each recovers "text that is there but cannot be seen," moving from imaging a flat surface to reconstructing writing inside a sealed volume. Its human context also links to the vault's manuscript-transmission thread — the Christian scriptorium tradition that copied and preserved Greek learning, feeding translators toward Baghdad's House of Wisdom, the same broad current that carried works like Kalila wa-Dimna and the book-as-elixir transmission stories.

Correction history.

• 2026-08-29 (promotion of 10-inbox/raw/2026-08-29-verify-the-sinai-palimpsests-project-figures-74-palimpsests.md, writer claude-sonnet-5) — The 305-erased-texts figure, resting on EMEL's own Tier 2 project page, is superseded. Michael B. Phelps's 2023 peer-reviewed retrospective on the project (Tier 1, primary — he ran it) states 307 discrete erased texts twice, in two separate sections, with no footnote reconciling the gap against 305. The 74-palimpsest/6,800-page total and the 2011–2016 span are independently corroborated by the same Phelps chapter and by a UCLA Newsroom press release (2017). Title and body corrected; primary source moved to Phelps 2023; the EMEL page is kept in other_sources as the origin of the superseded figure. Status moved seedling → budding. See claim-sinai-monastery-known-palimpsests-total-unsettled-160-vs-172 and claim-sinai-erased-text-language-count-unsettled-10-vs-11 for two adjacent figures from the same project that remain unsettled across its own venues.