According to the nature of their anthocyanidines, the anthocyanins pigments are divided into three groups which differ for the number of hydroxyls present:

 

1° GROUP of pelargonidin (scarlet red)

 

2° GROUP of cyanidin (crimson red)

present in flowers and in some fruits such as cherries, redcurrants, raspberries, etc.

 

3° GROUP of delphinidin (blue-red)