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have you had a go with liver of sulphur before? smells absolutely horrible but it patinas the copper instantly so you can polish up the high bits straight away

I have used it for larger scale sculpture pieces but never tried it on jewelry before really. Would it damage the stones?

i think its ok, ive dipped whole pieces before but it would depend on the stone, if its porus or not i guess. you can also just paint it on to avoid the stones

Cool, thanks for the tip. I'll have to get some and experiment