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Yes, you are right, this color difference could be because it was glued inside the box.

Does the stone look like a double sided natural "combo" of dark and light coloured stone or it's just me? If the stone has this, it's another characteristic of a Thuringian. And, it's not glued, is...

When you see a vintage natural stone with a description that says "don't use oil" or something similar, it's probably a Thuringian. And the slurry stone was used on Thuringians and coticules mostly....