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Don't really understand what you mean. Thuringians don't tend to discoloration in any way in normal atmosphere and sunlight. The only way you can create discoloration is by impact of stronger acid...

Well this small piece of rock (it actually isn't that large only about 25 x 9 cm :nono:) has enormous sharpening power. A knife produces black swarf in only a few strokes...

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I had to...

This beauty came from the typical layers at the border of the thuringian whetstone quarries.

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You can recognize the holes in the stone material on the backside.

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This is...

And another one, that I prepared for a friend:

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Just made from the cut-end of the old production of the thuringian miners. V-shape, backside left natural.

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9 inch long, 2-2...

Haven't posted here for e while, but was just preparing this great cloudy thuringian:

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It is really a beast, 9'' long and 3 3/8 ''wide by 1'' thick at the thickest point - weight 1.1 kg....

The black one doesn't look like the typical LaLune/ Special stone which is gray has a very unique metallic shining. But LaLune also sold slate stones that are simply black.
Here is an example that...

Very nice thuringians, Antoine.
The black one - could be a thuringian, but also something entirely else. Looks like a slate hone though. Whats a moon stone? Are you talking about the LaLune hones?

Continuation....

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Here are a few more of the cloudy ones.

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One might ask how the first whetstones were found. Nowbody went into the mountains thinking, I need a sharpening stone for my...

Great one! What size does it have?

[QUOTE=MODINE;1104588]They are indeed beautiful thank you for sharing. Do they change color from incandescent light to sunlight similar to some gemstones? I like the term “cloudy thuringians”, please...

Doesn't really look like a slate and also not like a TOS.
I would have said from the pictures could be a Llyn Idwall, but when you say the stone is soft it is not LI.
Has the stone used with oil...

This thread is about the beauty of thuringian stones. I am not talking about honing capabilities, hardness, grit or what else- just about the beautiful look of these stones.

From all the...