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Alum crystals and metal corrosion


#1

I’m making some hanging sculptures using copper and fine silver, and
I want to grow alum crystals directly onto them. My question is, how
will the metals react over time with the crystals? I also may do a
liver of sulphur or a silver black patina on some of them and am a
bit concerned these may react badly. Any help would be greatly
appreciated!

barb