Synthetic Ruby and Agate Stones

A

Atl

Joined
Jan 14, 2014
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Are these materials good for putting a fine edge on a blade? I got a Cold Steel Spartan that I want to bring close to it's potential. I was wondering if these stones are acceptable for this purpose.
 
Synthetic ruby stones work wonderfully. The finest grade is for edge finishing only. I'm not familiar with agate stones.
 
Bill DeShivs said:
Synthetic ruby stones work wonderfully. The finest grade is for edge finishing only. I'm not familiar with agate stones.
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I bought a stone from China recently. One side is sintered ruby and the other side is agate. The stone is advertised as 3000 and 10,000 grit respectively. I am familiar with knife sharpening using Arkansas, diamond, and ceramic rods. I can put the Spartan against the ceramic rod of unknown grit (but it seems relatively fine) and it comes to a very sharp edge quickly. I can then put it against the ruby and the edge stays about the same. Then I use the agate side and it actually dulls the blade. I am just wondering what is up. If anyone has an idea please chime in.
 
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