It would work to change the Juice color. I'm not sure anyone has tried that though.
BTW, I know you were just asking...however in my search I found this on the net:
"Blue 1 and Blue 2
Blue 1, used to color candy, beverages and baked goods, may cause cancer. Blue 2, found in pet food, candy and beverages, has caused brain tumors in mice.
Red 3
This food coloring is used in cherries (in fruit cocktails), baked goods and candy. It causes thyroid tumors in rats, and may cause them in humans as well.
Yellow 6
As the third most often used food coloring, yellow 6 is found in many products, including backed goods, candy, gelatin and sausages. It has been found to cause adrenal gland and kidney tumors, and contains small amounts of many carcinogens."
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ice