alt Hacker News30 scrolls, maybe? Something like that. I scanned Pherc Paris 4 and Pherc Paris 3 at Beam line 18 at ESRF back in March.
The team did "the campfire scroll" experiment a few years ago to replicate carbonization, unrolling, and ink detection. That is the only case I am aware of. It proved the method could work but it's not a source of say training data; it varies too much from the real scrolls.
The main limitation is time and cost. We have to scan on what is AFAIK the most powerful x-ray beam line in the world. It is not cheap
You had to pay? I understand the machine cost many hundreds of millions of dollars, but I would have thought for academic researchers doing open science, the beamtime is free (funded by the govt / science trusts).