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Black-damp, sometimes also called choke-damp, or “stythe,” is one of the gases frequently found in the workings of coal mines. It is distinguished from fire-damp by the fact that it is not explosive when mixed with air, but extinguishes flame; and from after-damp by the fact that it is not the product of an explosion, but collects in the workings under ordinary conditions.

proceedings of the royal society of london

I. Notes of an enquiry into the nature and physiological action of black-damp, as met with in Podmore Colliery, Staffordshire, and Lilleshall Colliery, Shropshire