Polen Coins Cupper colered,5 Groszy? [solved]

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Wasabi
Joined: 16 Jan 2022
Posts: 5
Posted: 10 Jun 2022, 10:48 #
Edited: 10 Jun 2022, 10:50
Posted: #
Edited:

I have here 2 copper-colored coins 5 Gr Poland, weight from left to right 2.5gr,2.6gr and 2.5 gr,Manipulated? Usually brass colors found no indication of misembossing,who can help?

 

Idolenz Catalogue referee
Joined: 13 Jul 2013
Posts: 9583
Posted: 10 Jun 2022, 11:08 #
Posted: #

Looks like someone did some dezincification on those coins. Especially the middle coin looks like longer acid exposure the other additionally heated.

Similar to these cents I played with:

left:  zinc-coated then heated, middle: acid “cleaned”, right: overheated.
Wasabi
Joined: 16 Jan 2022
Posts: 5
Posted: 10 Jun 2022, 11:35 #
Posted: #

Tthat could well be possible, thank you first,

Topic locked (Numista Robot, 9 Sep 2022, 08:15)
Status changed to Solved (Wasabi, 6 Dec 2023, 19:26)
Status changed to Solved (Wasabi, 6 Dec 2023, 19:26)
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