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Vinegar and fire with scrape test = no reaction.

Thank you sir, that is what I was looking for. Someone had told me that copper sulfate was a way to test for magnesium also. I will try the vinegar and burn test since I do not have any copper...

I pecked it with a grinder and no sparks.

What are cable company amp cases made of? Cast aluminum? Magnet does not stick. These are old C-core amplifier cases. I think they are cast aluminum? I have not done a spark test yet. Just wondering...