bright carbs

[Dick Nyquist <dickn@hpspdbc.vid.hp.com>]

carbs are either alum or zinc die castings. Anodize is usually
used on alum that is NOT diecast. Die cast alum has a higher silicone
content and tends, as a result, to uneven discoloration when anodized. 

Zinc can not be anodized at all. Zinc lends itself to chrome plating.
Chrome plating die cast alum is not as easy.

/dick