Just an illusion of light, not a blue pigment
The photos are all my original ones.
Bluebells
Cornflower
Gentian
Veronica
Catang
Morning glory
Plumbago
Cornflower field
Hyacinth
Male peacock
Peacock feather
Mallard
European oil beetle, female
Gossamer-winged butterfly
Another Gossamer-winged butterfly
Morpho butterfly
Morpho butterfly, another species
Damselfly
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Anthocyanin being water soluble determines the colour of the flower according to pH change. It is quite interesting to know that these plants to some extent downgrade themselves to use lower energy light which kinda limits their growth as most of the higher energy blue lights are reflected. The physics behind this blue colour is really astonishing.
Thanx for posting such a nice educational post! Would love to read more from you :)