Peonidin-3-O-glucoside is anthocyanin. It is found in fruits and berries, in red Vitis vinifera grapes and red wine,Peonidin 3-O-glucoside on www.phenol-explorer.eu in red onions and in purple corn.Anthocyanins isolated from purple corn (Zea mays L.). Hiromitsu Aoki, Noriko Kuze and Yoshiaki Kato (article ) It is dark red to purple in colour.
See also Phenolic compounds in wine
References