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Click on image for the lowdown. 
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| | | Forums66 Topics128,162 Posts1,057,049 Members48,463 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | Weren't most parts like that given a chemical dip at the manufacturing site? like ecoat is applied now as a basic protection.
My guess would be a phosphate dip or something that changed the surface molecules in the bond.
Add heat and time and it turn black????
Give me ambiguity
or give me something else
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