When I etched I used Radio Shacks Etchant, made for electrical circuit boards. I used the solution to about 15% with water. They say you should use distilled water but later on I was using my well water.
I don't have a picture of the etching tank but it is 4" PVC with a flat cap (glued) to bottom and a loose cap for the top. Tank is big enough for 32" barrels and some spare space.
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