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Etching with salt?

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OK this is cool....

 

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That is cool and didn't realize it was done that easily! This process reminds me of using electrolysis for cleaning coins/jewelry/relics which has to be done VERY CAREFULLY...just don't ask me how I know :>((  

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I wonder if this is any steel or a certain alloy?

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There's a number of ways that could be accomplished. The hard bit is the stenciling. 

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7 hours ago, chrisski said:

I wonder if this is any steel or a certain alloy?

I saw a video where the guy etched stainless steel as well as regular steel doing testing using this process, so I would guess if the material will conduct electricity and corrode it will most likely etch.

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I've been etching with hcl and peroxide onto knives and it's certainly easier to do between  annealing and hardening the steel.

And like Homefire mentioned above, toughest part for me is the etching.

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