I will die on this hill, because I'm right. Painters put on the first layer in saturated colors like this, then add detail, highlight and shadow. The base layer stuck to the statues, and the rest was washed away.
This whole thing just won't go away because many people are operating outside their area of expertise on this subject.
Painters layer paint, starting with a saturated base color. These archaeologists are simply looking at the paint that was left in the crevices.
I assume you didn't read the article, since that's their exact point...
"Since underlayers are generally the only element of which traces survive, such doctrines lead to all-underlayer reconstructions, with the overlayers that were obviously originally present excluded for lack of evidence."
> Why, then, are the reconstructions so ugly?
> ...may be that they are hampered by conservation doctrines that forbid including any feature in a reconstruction for which there is no direct archaeological evidence. Since underlayers are generally the only element of which traces survive, such doctrines lead to all-underlayer reconstructions, with the overlayers that were obviously originally present excluded for lack of evidence.
That seems plausible -- and somewhat reasonable! To the credit of academics, they seems aware of this (according to the article):
> ‘reconstructions can be difficult to explain to the public – that these are not exact copies, that we can never know exactly how they looked’.