Colours and Pigment Tyrian purple: The lost ancient pigment that was more valuable than gold

https://www.bbc.com/future/article/20231122-tyrian-purple-the-lost-ancient-pigment-that-was-more-valuable-than-gold?utm_source=pocket-newtab-en-gb

https://www.reddit.com/r/ArtefactPorn/comments/180j741/a_womans_blue_dress_united_states_1881_1880x1780/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button