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Sodium and potassium carbonates are valuable for fluxing off silica; mixed with potassium nitrate sodium carbonate forms a valuable oxidizing fusion mixture; “black flux” is a reducing flux composed of finely divided carbon and potassium carbonate, and formed by deflagrating a mixture of argol with � to � its weight of nitre.

"Black Flux."—A mixture of finely divided carbon with carbonate of potash or with carbonates of potash and soda.

Statesmen deal in proximate principles,—unstable compounds; but war reduces facts to their simple elements in its red-hot crucible, with its black flux of carbon and sulphur and nitre.