[R-390] Name plates

[Forrest Myers]

Hello All,
 My r-390A was manufactured by Capehart. It did not arrive with a name plate
and I've been looking around for a Capehart plate but haven't come across
any. However, I did find a picture of one on the web. Had a bright idea, why
not make one?
Figured I could fix up the image of the name plate from the internet and use
it to photographically reproduce one. I thought I'd use the methods used for
photo etching printed circuit boards. The main difference would be that I
wouldn't want to etch the metal away but just make it black. Does anyone on
the list know what chemical would be used to cause aluminum to turn black?
Would it have to be done with electrolysis? Any help would be appreciated.

Forrest Myers
AG4ND