Okay what part of a So what you're looking at the black cud on the quarter(pix attached) somehow looks different then the one on mine? As long as the die break or whatever starts at a coin's rim It is called a cud. As for steel melting, how should I know .I just know the attached Black Cud was caused by a STEEL FLAKE WHICH HAD DETACHED ITSELF FROM THE THE DIES OBVERSE FACE. Previously one or all of you said their were no cuds which are black.That a black cud is a caused by soldering. Key word Rim to Rim Cuds and learn something. This is the Reverse. I will rest my case.
I'm not sure how a cud can be black. Shouldn't a cud be the same color as the planchet? Would you please clarify why you think the cud turned black before you rest your case.