Heh. More seriously, I first browsed the textile & inscription images, guessing they'd most likely have color targets. https://collections.louvre.fr/en/ark:/5

Heh. More seriously, I first browsed the textile & inscription images, guessing they'd most likely have color targets. https://collections.louvre.fr/en/ark:/53355/cl010000055 https://collections.louvre.fr/en/ark:/53355/cl010000055 As you can see, they do have scales (of course). I know nothing about archiving, archeology, history. I'm just guessing that color calibration would be crucial to their studies. I think you can infer white balance from those scales. And because they're two toned, maybe some of the gamut too? Not using a proper color target just seems like a missed opportunity.