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  • tkip commented on TechShopJim's instructable How To Electro-Etch a Solid Metal Plaque1 year ago
    How To Electro-Etch a Solid Metal Plaque

    Thanks for this! Have you tested salt water on bronze? I have read that it does not work on bronze, so am curious if you've tried it. Thanks!

    Thanks! So, I do electro etching of bronze in Cupric Nitrate (hoping to switch to saltwater, but not sure it works on Bronze) and I am using a piece of Stainless Steel grate as the Cathode/Sacrifice... and that piece of Stainless is dissolving gradually!... it's not accumulating metal, as one would expect, it's getting covered in what looks like rust, and falling away around the edges. Any ideas why, and do you know if this might contain hexavalent chromium? Sorry to be such a pest, but there are so few people out there who have knowledge about this. Thanks again!

    Thanks for sharing the info about hexavalent chromium. Is it created only if steel is the target of the etching, or does it also apply if it is used as the sacrifice piece? Is it a vapor, a sludge?

    Amazing info, thank you. (I'm unreasonably excited to have found someone who knows what they are talking about with this stuff.) :) I think you are correct about the tin and copper collecting in a soft layer, as it flakes off when removed and dry... but the stainless is also definitely eroding away. There is a black sludge in the bottom of the Cupric Nitrate after several etches, which I strain out and remove using mask/gloves/goggles, etc.; and I have never put the stuff down the drain, I've been collecting it in paper towels and storing in a kitty litter jug until I could take it to hazmat because I dont know what it is... Do you think this black sludge could be hexa chrome?

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