I think our disagreement is over blue pigment vs blue appearance. Lots of things in nature use structural coloration https://en.wikipedia.org/wiki/Structural_co

I think our disagreement is over blue pigment vs blue appearance. Lots of things in nature use structural coloration https://en.wikipedia.org/wiki/Structural_coloration https://en.wikipedia.org/wiki/Structural_coloration Microstructure interference can create blue, but perhaps not the flower pigments themselves