barebackjack
I received it.
As the other folks here might have the same question I think they should hear my answer (just in case they are curious). :grin:
OK, it turns out that the cams are aluminum and they are anodized black.
Anodized aluminum has been treated to form a protective (often colored) layer of aluminum oxide on its surfaces.
This may be a very thin coating such as is used for decorative purposes or it might be a fairly thick coating, often called "hard anodizing".
The only real difference is the thickness.
Aluminum Oxide is very stable and there are no commercial cleaners that I'm aware of that will "desolve" or remove it.
The only way to remove it is to use a mechanical method such as machining, grinding or sanding.
Once removed, nature will cause the aluminum to combine with the oxygen in the air and reform a thin coating of aluminum oxide on the part.
OK. Now, did you know that at the top of the Washington Monument is a small 100 ounce trapezoid "capstone" that is made out of pure Aluminum?
When the monument was made, pure aluminum was so difficult to make in any quantity that the little trapezoid was worth a fortune!
As the monument was started in 1848 and finished in 1884 it runs past the time we talk about here on the Builders Bench so, enough said about aluminum.
Now, back to the muzzleloaders.