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Because the pH of the juice is changed.
Gold grape juice is orange.
Grape Juice from Concentrate (Filtered Water, Grape Juice Concentrate), Grape Juice, Maltodextrin (Dietary Fiber), Ascorbic Acid (Vitamin C) - Taken from Welch's 100% Grape Juice (with added fibre)
The color of the grape, as well as the taste. White grape juice is a smoother taste, something more akin to what you'd expect from a mango not a grape, and while red grape juice is sharper and more pow to me, it seems slightly sweeter. This is, of course, only my taste buds.
Grape Juice
Juice from grapes, and usually added sugar, and maybe water.
It is a chemical change because it can not be reversed
Yes gold grape juice is yellow
When adding tomato juice to cabbage juice, the cabbage juice turns redish
Not necessarily. Let me use an example: If you look at the color of grapefruit juice, you will notice it's light pink. If you look at grape juice, it's dark purple. But unless the grapefruit juice is sweetened, than you will find that the grape juice is sweeter, despite the dark color.
No. Grape juice is a mixture of many compounds.
No. If you mix yeast and grape juice you get wine.