Usually you want to avoid any metal with coatings, zinc, cadmium etc. There are other metals such as valve stems etc that should be avoided. Always use caution when cutting into closed containers. Who knows what was in the container originally, or what was put into the container just before you got it?
Best way I have found is to post the specifics of the metal (where it was found etc, and photos) in the IForgeIron forum and ask the membership for suggestions. They most likely can assist you with precautions.
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Tools do not make the blacksmith, the blacksmith makes the tools. gc
If someone questions your standards, they are not high enough.
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