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Old 2021-04-05, 2:22pm
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FosterFire FosterFire is offline
SCIENCE Teacher!
Join Date: Jul 19, 2005
Location: Wylie, TX
Posts: 2,129

It's a chemical reaction. It can be used for some interesting effects, like turquoise on ivory. You can prevent the effect only by keeping the 2 colors from touching. Even casing in clear is not 100% effective but you might get closer to what you want.
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