The waste is carbon black:
"an extremely fine black fluffy particle, 10 to 500 nanometers (nm) in diameter"
Which is used in an additive in many industrial processes, namely tire reinforcement.
Currently appears to be mostly sourced from oil furnance or thermal processes, so ours coming from an environmentally friendly process could sell at a premium, even for waste. I'm unsure how much of the waste stream fits into the 10- 500nm dia. range though.
Ann: Commercial-Scale Milling Trials Deliver Increased Yields, page-20
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