Dual purpose magnetic toner - Black Copy Company, Inc.
98.5 parts of this powder is dry blended with 1.5 parts (by weight) of Regal 99R (carbon black with a particle diameter of 36 millimicrons, produced by the Cabot Corporation). After thorough mixing, the powder is fed by gravity, using a vibratory feeder, into the top of a Bowen spray dryer at the rate of 340 grams per minute.
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