Borax bead test

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A chemical test to disclose the presence of certain metals in a sample. A clear glassy bead of borax fused in a wire loop will react chemically with the salts of certain metals and yield colors that help to identify the metal; e.g., manganese compounds produce a violet bead, cobalt produces a deep blue, etc. See also: blowpiping
Source: Dictionary of Mining, Mineral, and Related Terms

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