Id of a stone, some one from france!

Here is a black stone that had an Escher, “Dark Blue” end label (blue).

Based on the slurry and the original photo probably a slate, maybe a Thüringen.

Hard black stones like Arks will slurry white.

Some “special stones” were grey or dark grey.

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Originally Posted by jemmo

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That is slurry
The size is about
95mm x 32mm x 10 mm

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Could fit to some smaller thuringian Stones Sizes beiing around 10x3x1...looks like thuri slurry but i would prefer daylight shots and clear shots to be more correct then just guessing...

With that size it could be a thuri pretty easily. I didn't realize it was so small.