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What compounds can be added to a solution that will change color when exposed to oxygen?

Question asked by Jason Kabanas on Aug 23, 2018

I would like learn of the various chemicals or compounds that can be added to or dissolved into a solution and dried/cured, but when exposed to oxygen will change color. Is it as simple as adding some kind of iron or copper particles? Will they oxidize quickly? What color changes when exposed to oxygen, instantly that is...

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