How much information can you get from a speck of purple pigment, no bigger than the diameter of a hair, plucked from an Egyptian portrait that's nearly 2,000 years old? Plenty, according to a new study. Analysis of that speck can teach us about how the pigment was made, what it's made of—and maybe even a little about the people who made it. The study is published in the International Journal of Ceramic Engineering and Science.
source https://phys.org/news/2020-11-science-reveals-secrets-mummy-portrait.html