TIL about this tool, the Reinigungsschaber !
Schmeckinger @ Schmeckinger @feddit.de Posts 0Comments 140Joined 2 yr. ago
Schmeckinger @ Schmeckinger @feddit.de
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I looked a bit more into it and the first spec I found had a knoop hardness of 600 which should be mohs 6-7 so hardened steel should be able to scratch it.