Flowers have a secret signal that’s specially tailored for bees so they know where to collect nectar. Nanoscale patterns on the petals reflect light in a way that effectively creates a “blue halo” around the flower that helps attract the bees and encourages pollination. Most flowers appear colourful because they contain light-absorbing pigments that reflect only certain wavelengths of light.
The 'blue halo' effect: How some flowers seduce bees
AFP
Flowers produce an 'invisible blue halo' that helps bees find them
