I've posted about Phoenician Purple before - the dye mentioned in this video as coming from snail shells. That's an amazing story, too.
The early part of this video defines pigments versus dyes. I'll admit that I didn't have any idea there was an actual distinction between those two. I am curious, though, as to whether the insoluble and soluble designation depends on the nature of the solvent. Like are some chemicals pigments in oil but dyes in water-based solutions?
Maybe I'll hunt down that in a different video.
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