According to the great historian Herodotus, the Phoenicians were called ‘the purple people’ because of the dyed purple cloth they sold. The dye was long-lasting and impossible to wash off their hands. Purple is an expensive pigment (they got it from sea-snails that live inside murex shells). Traditionally, only royalty (or at least the very rich) can afford purple robes.
https://www.etymonline.com/word/Phoenician
https://www.ancient.eu/phoenicia/#:~:text=The%20purple%20dye%20manufactured%20and%20used%20in%20Tyre,dye%20would%20stain%20the%20skin%20of%20the%20workers.
Take a look at this site about the history of color: http://www.webexhibits.org/pigments/intro/purples.html#:~:text=Purple%20is%20typically%20defined%20as%20a%20mixture%20of,violet%2C%20prepared%20in%201859.%20Timeline%20of%20purple%20pigments.
https://christianity.stackexchange.com/questions/41580/what-is-the-significance-of-colour-purple-in-the-robe-that-jesus-was-made-to-wea
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