ajxs
2 days ago
In case anyone doesn't know, Oxyrhynchus is a major source of archaeological discoveries. Particularly ancient (Ptolemaic/Roman Egypt) papyrus fragments recovered from an ancient landfill on the outskirts of the city. Notably some of the earliest-known Christian textual artefacts were found there (the actual earliest fragments came from elsewhere in Egypt). It turns out that Egypt's hot and dry climate provides the perfect environment for their long-term preservation.
cjs_ac
a day ago
One of the texts found in Oxyrhynchus is the oldest extant Western martial arts treatise: https://wiktenauer.com/wiki/Oxyrhynchus_Papyrus_(P.Oxy.III.4...
thaumasiotes
2 days ago
> It turns out that Egypt's hot and dry climate provides the perfect environment for their long-term preservation.
Cold and dry would be just as good. It's the dryness that matters.
vlovich123
2 days ago
heat speeds up oxidation/ accelerates reactions but also decreases relative humidity for a constant moisture constant.
tadfisher
2 days ago
Only because humidity is measured relative to the vapor pressure at a given temperature. It only matters for preservation when humidity reaches 100%.
addaon
2 days ago
Is this true? Paper (and I assume papyrus) expands and contracts with varying humidity even below the saturation point, and this motion embrittles and cracks it, no? So consistent humidity is key, and "consistently dry" is much more achievable than "consistently at an arbitrary other point."
nerdsniper
a day ago
Your intuition is more correct: it is not true. The relative humidity of the air matters below 100% as well. I think the parent commenter mistakenly assumed that only "condensation" matters, but materials will absorb moisture from the air even if the water doesn't condense. Entropy drives the dispersion of moisture, and some materials are "hygroscopic", meaning they don't merely reach equilibrium with the air, but actually concentrate moisture from the air and get significantly more wet than the air which feeds it water.