A lot of foreign military rifles are painted with a black paint that when it contacts a solvent it comes off purple.
You see this a lot on imported AK rifles.
I don't know what kind of paint it is, it looks black but come off with solvent as purple.
I found this out in the 60's when I dropped a part in a container of lacquer thinner to clean a surplus rifle and the thinner turned purple.
I've most recently seen this with a Bulgarian SLR-96 and a Bulgarian AK-74 built from an unfired surplus demilled rifle.
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