A morpho butterfly's wings have no blue pigment at all — the colour is pure structure
The dazzling blue of a morpho butterfly's wings comes from no pigment whatsoever. Microscopic ridges on each wing scale, arranged in a precise layered lattice, reflect and interfere with light waves so that only blue wavelengths bounce back strongly, a trick called structural colouration. Tilt the wing and the colour barely fades, unlike a dyed pigment, because the effect comes from the shape of the structure itself rather than any chemical absorbing other colours.