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Hi Han,

that is not a black mottled Thuringian, but looks like a simple black or blue one (of course with some structure). Hones like this black or very dark blue were also mined by the Escher...

Yeah that's an interesting label that I have seen before.
To be honest - I am not 100% sure that it is an Escher label. It might also be a label of a different company that want to profit from the...