If grapes are both green and purple, why are grape jellies always purple?
Question #117159. Asked by star_gazer.
star_gazer
Answer has 1 vote
star_gazer 23 year member
5236 replies
Answer has 1 vote.
All grapes have juice that is the some color which is a whitish or yellowish hue. It is only the color of the skins that are different. When Welch's grape jelly began in 1869, the purple color of the skin of the dark Concord grapes were used. This color has continued.
https://en.wikipedia.org/wiki/Fruit_preserves#Jelly 