Stainless steel etching

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I tried to etch a stainless steel today.. I used a mixture of hydrochloric acid (HCl), water and hydrogen peroxide (H2O2). The peroxide acts here as a catalysator, so when the solution stop etching, just add few mls of it and it start again (as long as there is still some HCl in it..). First 10 seconds after submerging the steel sheet into the etching solution nothing happen then rapid reaction begin 😉 Next I will try 3:1 water:HCl, and gradually adding of H2O2.

I also tried to apply a photoresistive layer on the clean stainless steel sheet, I used czech Positiv 20.

Clean sheet in an vessel – to get rid of a dust is critical.

Immediately after applying..

After few hours, the layer gets more even, but this is still bad result, however this was not a subject of the test.. I just wanted to see if that preparation will hold on the sheet.. Success!