borax bead

noun

, Chemistry.

a bead of fused borax, used in chemical analysis for the identification of certain metal oxides.

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.

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