Hey dont feel bad bro. A lot of stuff is coated and u just never know till you scratch or grind it. I often kik myself in the ass when I figure I have been throwing things in the tin when indeed they are not tin lol.
I just learned yesterday old hub caps from a 50's dodge are brass lol. I thought it was stainless and hit it with the grinder. No spark, wth. Look closely and Im like **** man, yellow brass. Started scrambling and pulling them all back out of the bin.:">
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