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Glad you brought that up, for some reason I can't explain I'm totally discusted by those pictures as well. And not to mention the fact that they prove absolutely nothing...

Actually well over a century : http://straightrazorpalace.com/hones/131763-carborundum-history-manufacturing-since-1891-a.html#post1714201

Just Wow Steel, masterful post, and a sweet Holley, thanks for sharing.

I use mine as a rubber (slurry stone) only, i have diamond plates for flattening. Personally i wouldn't use it past the 1k range since its a 600 grit stone.Perhaps some use it as a stone to clean the...

My brown turd came with the green brick a few years ago, was very skeptical at first to use it, because many posts about it on this forum claiming just to get rid of it, its useless. Tried it anyway...