[ARC5] Satin finishing aluminum

[Mike Hanz]

Could you elaborate on this caution, Roy?  I'm a little puzzled because 
the chromate conversion chemicals (Iridite and Alodine are simply a 
couple of the proprietary trade names) are relatively benign compared to 
many that we deal with as old radio restoration enthusiasts.  Just 
curious as to the basis for the warning.

Best wishes,
Mike Hanz

Roy Morgan wrote:
> At 11:43 PM 10/26/02 -0400, you wrote:
>> Does anyone know how aluminum was processed to achieve the satin 
>> finish typical of ARC-5s and similar WW II gear?
> 
> Caustic etch and clear irridite.
> 
>> How about restoring such a finish?
> 
> Do not attempt this at home.