Here is a question from one of our customers:
Q: can you tell me how to safely clean copper nuggets? Mine piece has darkened.
I had to do some research on your question but I found this great article on natural copper and finding and taking care of it. I think this is what you are looking for.
After reading the article I am curious about collecting metals. I have stayed away from them due to allergies but I may reconsider. Thank you for stirring my curiosity.
Master Crystal Healer