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I have tested and used these ultra-fine finishing stones. The small brown paddle hone is used the most. Only “good” razors can be used on this stone. This type of stone can be stamped on the side...

Here are some pictures of a few different brown natural finishing stones. The Fox hone has a label. All perform best with oil. All behave very different.
Mike

http://i.imgur.com/LFzdz.jpg
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