Yeah its weird, with the light directly on them they just look polished but any light at a angle and they have a blue hue to them, it does appear to look a lot more blue with the led lights vs the regular drop light
That has to do with the material. Different metals have different colors to them. Chromium tends to turn an inherent bluish, while nickel has a yellowish tint. Other alloying elements have their own colors too. It's not so much a color, but the tint that the shiny surface tends to have.
The method of manufacture has lots to do with it too. No matter what you do, a casting (like a cam core) has some inherent porosity. This isn't a bad thing, the pores hold oil better than say a billet part. Then there's the treating of the cam - many are phosphated (comp cams does a really aggressive phosphate) which can get down in the pores, and even once the cam is burnished and polished, that phosphate can show up as a colored hue. Either dark brown, gray, or white-ish depending on the type of phosphate and the oil used. Even unplated the pores can shift the hue of a part, or make it look 'dull' or 'hazy' even when polished.
