[R-390] Polishing

[David P. Goncalves]

My R-390 power supply chassis is blackened from a fire under the rectifier
tubes. I've removed most of the soot with water and a Q-tip.

Today I got the idea that I was going to use NEVR-DULL to remove the rest.
Well, that it did, but it also removed the chassis 'yellow'. Now I have a
part yellow, part silvery chassis.

What is this yellow color?
Does it (usually) come off whenever polished?
Is there a need to keep it on?


David Goncalves