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Comprehensive
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ferric oxide a red-brown solid compound in the natural form of iron ore or rust, processed for use as a pigment and in metallurgy, magnetic tapes and polishing compounds.
furnace in metallurgy, to prepare (metal) by heating in a furnace. [1/3 definitions]
hydrogen sulfide a poisonous, colorless gas that has the odor of rotten eggs and is used mostly in chemical manufacturing and metallurgy.
potassium cyanide a highly poisonous white powder used as an insecticide and in photography, electroplating, and metallurgy, esp. in extracting silver and gold from ores.