I've herd of four different ways to identify if WWII German fabric is real.
First is the black light test, second is the whites in German material won't be a crisp bright white like modern clothes. Third is having that very old smell most antique military items do. And fourth is the burn test.
I read that original fabric will go up in flames instantly and not smell, and that modern fabric will have a stench and will catch on fire very slowly due to chemicals in it.
I used a thread from a German flag and used thread from some more modern material. Usualy both would go up instantly but on other occasions both would still would burn very fast, but not "instantly" even though it was still fairly fast, only difference was the modern thread smelt bad when I burnt it.
I was wondering how accurate the burning a thread test is?