A while back, I bought an ordinary-looking pizza cutter with a dull grey handle. However, I soon found out the hard way that the handle is made from some weird metal or alloy that reacts with water, staining everything it touches black:
"Water" here includes even slightly moist or sweaty hands, making this a real pain to use. What is this stuff and how do I stop it from staining? And for extra credit, why on earth would you make a hand-held kitchen utensil from it?!