Sal,
Great question for Ron I think!
However, original Mag wheels were initially gold because of the chemical they were dipped in post cast to protect them from oxidation. (Chromium VI complex?) They were totally gold like the GT40 cars then altered after the fact. A majority were painted black or allowed to toatlly oxidize giving the black/dark grey cast. The compound used in the dip had a gold cast initially.
Great discussion.....
This set is new NOS Magnesium: (SAAC31 picture via Ron)
This particular cars other set of sneakers are from 60's and are clearly hand painted.
Original Halibrand magnesium Cobra SC wheels never used.
Compliments Richsd
These found on CSX3034 were claerly retouched:
