How do you tone coins ex. rainbow colors?

2006-10-19 06:00:10 · 1 answers · asked by matt_sorrentino 1 in Science & Mathematics ➔ Chemistry

1 answers

Aluminum coins are colored through anodising, which is a chemical treatment of the surface to produce a strong oxide layer. This is how Mardi Gras coins are colored red, green, and black, among other colors.

2006-10-19 06:01:34 · answer #1 · answered by DavidK93 7 · 0⤊ 0⤋

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