Interesting that some ancient cultures in different parts of the world made blue part of their rituals and also lost the ability to produce the dyes. Egyptians, Jews (https://en.wikipedia.org/wiki/Tekhelet). Is it because blue->sky->God?
The real revolution in color was the invention of cheap synthetic blues starting with Prussian blue in the 19th century and led today by the ultramarines and phthalocyanine blues, which include our standard cyan used in every inkjet. When Prussian blue came out there were a few decades of artistic celebration at the dawn of a cheap, intense, and gorgeous blue. Hokusai's 36 Views of Mount Fuji is a particularly exuberant example of this new blue's early use.
https://biology.stackexchange.com/questions/56476/why-are-so...
Many fruits and flowers contain blue organic compounds (anthocyanins), but those are useless for making dyes or pigments, because they are unstable and they loose their color very quickly.
https://en.wikipedia.org/wiki/Thirty-six_Views_of_Mount_Fuji...