Annatto seed of the tropical achiote tree (Bixa orellana) Science Image

Ref: 80200425b



Annatto seed. Coloured scanning electron micrograph (SEM) of the seed of the tropical achiote tree (Bixa orellana). The outer covering of the seed produces the red food colouring known as annatto (E160a). It is used for colouring cheeses, butter, smoked fish and custard powder but is known to also cause food allergies in some people. It is also used in herbal medicine. Magnification: x20 when printed 10 centimetres wide.