The Marsh test, developed in the mid-1830s and used until the 1970s, detected arsenic in a poisoned substance by mixing the substance with _ and _, then heating it to determine whether a metallic deposit would form.

The gas was later ignited and decomposed into pure metallic arsenic. This test was highly sensitive and could detect even one-fiftieth of a milligram of arsenic. It was a remarkable discovery, since before that, arsenic was widely used as poison in enormous amounts of murders, impossible to detect and trace.

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The Marsh test, developed in the mid-1830s and used until the 1970s, detected arsenic in a poisoned substance by mixing the substance with _____ and _____, then heating it to determine whether a metallic deposit would form.

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The Marsh test, developed in the mid-1830s and used until the 1970s, detected arsenic in a poisoned substance by mixing the substance with _ and _, then heating it to determine whether a metallic deposit would form.