My visit to a traditional forge in Kyoto changed how I handle hot metal

They keep a wet clay slurry nearby for cooling specific areas. This way, you can temper just the part you need without dunking everything.

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3 Comments

sage2047mo ago

Whoa, that's a cool method but honestly it seems risky. Wet clay can trap steam against the metal and cause hidden cracks. I've always had better results just using a directed air blast for spot cooling, way more control.

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the_piper7mo ago

Remember that risk with wet clay? A friend of mine learned the hard way. He used it to cool a knife blade unevenly. The steam pocketed and left a crack he only saw after polishing. Thing snapped during a stress test. Air blast is definitely safer.

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charles_black247mo ago

Yeah, that's the thing with old methods. They work until a hidden flaw shows up. @sage204 is right about the steam risk. I see this everywhere now, like using a kitchen sponge for way too long because it looks clean, but it's full of hidden bacteria. The problem is under the surface.

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