No idea what the pink splotches actually were. All I know is that really clean copper is pink based on my experience with cleaning printed circuit boards (PCBs) prior to soldering. But PCBs need to be really clean for a good reliable solder joint. Cartridge brass doesn't need to be really clean prior to reloading, unless your not using a carbide resizing die.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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