I say if a magnet sticks or is drawn to it then it is tin that is added to the copper. A magnet will not be drawn to aluminum or copper but I have never seen a magnet fall off of tin. My .02
Tin by itself is not magnetic. What is commonly refered to as tin is actually steel which may or may not have a thin layer of tin plated on to it.
Some brass from India for example will have a slight pull on a strong magnet. Things like those nick nacks and candle e. There is a small amount of iron in it.
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