Swiss 1919-B 10 Rappen. Any way to confirm brass?

These were made of brass or copper nickel with the brass being much more valuable. From what I see they both weigh 3.00 grams, is there any way to tell for sure the composition other than the color? I looked online and saw some certified as brass but also a few raw that people were claiming brass but appeared to be cu-ni.
I am 99% sure mine is brass and it helps there is a little luster around the edges but I sure would like to confirm it somehow.

Now........Everything must go.


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