[Chuck]

Years ago when dabbling in electronics I can recall dropping aluminum switch panels into a bath of some sort to give it a nice matt finish. After rinsing the panels a coat of semi gloss laquer protected it. I can recall using a common household product to make the etching solution, but for the life of me I cannot now recall what we used.

Does anyone know what will etch aluminum and give it a nice matt finish?
It may have been lye or something similar. Muratic acid perhaps? I know we had it around the house, so it could not have been too exotic. We mixed it with water.

I recall it really bubbled when the aluminum was dropped in. Only a minute or so was needed. When pulled out it had a black coating that we rinsed away, revealing that nice satin sheen.

I am contemplating doing the same with the switch panels on the dash, thus the need to know. Obviously my expertise in chemistry is sorely lacking. If any one can suggest a solution (no pun intended) I would be grateful.