a bead of fused borax, used in chemical analysis for the identification of certain metal oxides.
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How to use borax bead in a sentence
Uranium colours the borax-bead yellowish-green in the oxidising, and green in the reducing, flame.
Substances containing chromium impart a green colour to the borax bead in both flames.
The borax-bead is colourless in the oxidising, and dark-brown in the reducing, flame.
Didymium salts have a rose or violet colour, and impart (when in sufficient quantity) the same colour to the borax bead.
With borax bead it reacts for iron and sometimes for manganese.The Elements of Blowpipe Analysis | Frederick Hutton Getman