a bead of fused borax, used in chemical analysis for the identification of certain metal oxides.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for borax bead
Historical Examples of borax bead
Uranium colours the borax-bead yellowish-green in the oxidising, and green in the reducing, flame.
The borax-bead is colourless in the oxidising, and dark-brown in the reducing, flame.