I have some experience in the textile industry and it is known that items, whether piece goods or yarn, which are black (for most fibers) it is likely an over-dye; colors that failed to match the color that was intended, goes into a pile for black re-dye. It is easy for most fibers to over-dye something black. I imagine that for filaments it is something similar. My experience with black filaments is generally one where black breaks easier, and generally you can find PLA on sale if it is black.
Jim Kennedy
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