What is this material? Answered

Originally Posted by spinroch

Brass should show a yellowish color when ground down. I vote for stainless. (It might be Kryptonite, though)

Not all brass is yellow there is something called white brass found in higher end sink faucets handles.

White nickel brass is a grade of nickel silver. The white brass used for castings where a white color is desired may contain up to nickel. The 60:20:20 [Cu:Ni:Zn] alloy is used for white plaque castings for buildings. Nickel brasses known as German silver are copper-nickel-zinc white alloys used as a base metal for plated silverware, for springs and contacts in electrical equipment, and for corrosion-resistant parts. Extra-white metal, the highest grade, contains 50% copper, 30 nickel, and 20 zinc. The Federal Trade Commission prohibits the use of the term German silver in the marketing of silver-plated ware.

I'm pretty sure this is what it is.