There are 3 groups, or 6 types, of red anthocyanin compounds:
cyanidin [red] & [magenta] e.g. red-skin fruits & vegi
> peonidin [purplish red] & [red-brown] e.g. rose flower
delphinidin [blue, purple] & [blue] e.g. grapes
> malvidin [purple] & [purple]
> petunidin [purple] & [dark red]
A typical anthocyanin pigment appears red in acid, violet in neutral, and blue in alkaline solution.
Intense light and low temperatures favour the development of anthocyanin pigments.
3-Deoxyanthocyanidins are yellow anthocyanidins. 3-Deoxyanthocyanidins are reported to be stable to color loss due to change in pH.
Reference:
http://www.self.gutenberg.org/articles/3-Deoxyanthocyanidin
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