Flavylium dye, a model compound of natural anthocyanin, has a defect that its color stability is very poor. We have tried to complex the flavylium dye with several mesoporous silicas (FSM16, MCM41 and HMS) and succeeded to enhance the photostability of the dye against visible light irradiation. We have found that the light fastness is enhanced when the dye is incorporated into the mesoporous silicas exhibiting solid acidity that derives from an aluminum impurity. The solid acidity plays a role to
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