The relations between preservation conditions and quality change of the coo
kies that were made as one of fat rich confectioneries containing tea leaf
were discussed. Preserved in the dark, the rise of the POV of the cookies w
ith tea leaf was retarded according to the content of the tea leaf added. I
n contrast, in the light, the POV of the cookies with the tea leaf rose rem
arkably in a short period. This rise of the POV was considered to be caused
by the photosensitizative action of chlorophyll in the tea leaf.