Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Tests for Nitric Acid
It stains the skin yellow. When mixed with a little power of dissolving gold leaf. When mixed muriatic acid or sal-ammoniac, it acquires the with dilute sulphuric acid, and poured on a few fragments of zinc or iron in a tube, the evolved gas burns with a greenish white flame. Substitute alcohol for zinc in the last a red color, which is heightened by ammonia