I don't work on ancient sculptural #polychromy (or ancient art at all for that matter), so it's not surprising if I'm clueless on scholarly discussion of the problem @yora points out in this post: https://mastodon.gamedev.place/@yora/114400410044185691
But maybe somebody in my network is?
To paraphrase Yora: given the coloristic(?) sophistication of e.g., surviving wall painting from Pompeii and Roman-era mummy portraits from Egypt and much else ancient art, aren't modern reconstructions of sculptural polychromy wildly simplistic and is that partly because we're only able to sample, when anything of the pigment remains at all, the initial undercoat?