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I'm fairly certain the lighter stone is not hindostan because it does not have the banding I've seen on other examples.

Some of that darker brown spotting on the light stone went away after I...

With Water:
http://i25.photobucket.com/albums/c62/DAWinkler/Straight%20Razors/Hones/Natural%20Hone/IMG_5844.jpg...

Got some oil covered stones for really cheap on ebay. I think the darker is natural, but the lighter colored one is probably synthetic and only suitable for kitchen knives. The darker one seems to...