11B30B4
Well-Known Member
Well that makes sense but It still was not what I expected. I figured raw aluminum, regardless, enough elbow grease and some 100 grit sandpaper will remove just about everything shy of a bad memory. thanks for the information.It's there because the part is chrome plated. Typical chrome plating for applications requiring durability is a three-step process which starts with copper plating, followed by nickel, then chromium.The media blasting removed enough material to expose the first layer of copper plating.