Delphinidin

Delphinidin is an anthocyanidin, a primary plant pigment, and also an antioxidant. Delphinidin gives blue hues to flowers in the genera Viola and Delphinium. It also gives the blue-red color of the grape variety Cabernet Sauvignon, and can be found in cranberries and Concord grapes as well as pomegranates, and bilberries.
Delphinidin, like nearly all other anthocyanidins, is pH-sensitive, i.e. a natural pH indicator, and changes from blue in basic solution to red in acidic solution.

Glycosides

Several glycosides derived from delphinidin are known:

Myrtillin and tulipanin can be found in blackcurrant pomace.
Violdelphin is responsible for the purplish-blue flower color of Aconitum chinense.
Nasunin is responsible for the colour of the eggplant fruit's purple skin.
s including Clitoria ternatea ternatins