Cupel dust. [1913 Webster]
"Powder of steel, or copple dust." [1913 Webster]

angel dust, bite the dust, chalk dust, copple, cosmic dust, diamond dust, dust, dust bag, dust bowl, dust cloud, dust coat, dust contamination, dust cover, dust devil, dust jacket, dust mop, dust sheet, dust storm, dust wrapper, gold dust, hell dust, interplanetary dust, radioactive dust