Best way to remove these orange lines?

MorganMan94

Does anyone have any ideas for removing these orange lines on the back of this medal? There is also a spot on the obverse along with the rims. The coin is zinc not silver.

neildrobertson

Is it possible it's zinc coated iron or steel and that is rust?

MorganMan94

@neildrobertson said:
Is it possible it's zinc coated iron or steel and that is rust?

I am not sure, I have only seen this one before in silver but on the rim it says "Zink". For comparison here is one on Ebay, there are also a few similiar sold listing.

https://www.ebay.com/itm/Medal-1938-PCGS-SP63-Germany-Third-Reich-Colbert-C-114-Vienna-Mint-Rare-Silver-/302992928822?hash=item468bc93036:g:hHEAAOSwjkZcEDV8&nma=true&si=9rYnBe51CqMZ1%2FyvwSSvk7KJ9mw%3D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557

Namvet69

So it could be an improper alloy mix or a chemical stain reaction. Soak it in acetone, couldn't hurt it.