Blue fabric dyes were rare and very expensive until aniline and its colored derivatives were synthesized. There was Tyrian purple and royal blue [1], both deriv

Blue fabric dyes were rare and very expensive until aniline and its colored derivatives were synthesized. There was Tyrian purple and royal blue [1], both derived from marine mollusks. [1] https://en.wikipedia.org/wiki/Tyrian_purple https://en.wikipedia.org/wiki/Tyrian_purple