I am pretty sure he made that video though, it's where I learned what prussian blue is 😳
this post was submitted on 16 Oct 2023
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There is also the purple cloth dye used for royalty that involves crushing a specific type a snail and prepping the resulting material to dye the cloth and “ferment” the cloth in the liquid for a predetermined amount of time to get the deep dark purple.
https://www.smithsonianmag.com/smart-news/in-ancient-rome-purple-dye-was-made-from-snails-1239931/