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kostj

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  1. kostj
    Brass does not turn to gray. Check out the photo from the last post.
  2. kostj
    The difference in density is very small. The density of 5 centavos 1965 Cu 75 Ni 25 is 8.92; brass, Cu 85 Zn 15 is 8.66 g/^3 cm. The difference is near 0,01 g for coin. I don’t have such precise instruments. Check out comparative photos.
  3. kostj
    Thanks. Your color correction is wrong. The coin looks the same as on the display i.e. look like a 5-cent nickel coin. CuNi and brass coins have weight 4 grams. Different catalogs specified diameter both coins 20.4 - 20.5 mm. How can density be determined?
  4. kostj
    The problem is the brass and copper-nickel coins have the same weight, diameter and edge.
  5. kostj
    Hello, Is it brass or copper-nickel coins?