borax bead

American  

noun

Chemistry.

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

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Example Sentences

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borax bead

It frequently contains a small quantity of Mn2O3, which may be detected in the borax bead.

From The Elements of Blowpipe Analysis by Getman, Frederick Hutton

When heated on the borax bead it gives an equally beautiful green, which is, however, rather more inclined to chrome than emerald.

From The Chemistry, Properties and Tests of Precious Stones by Mastin, John

This powder should then be fused in the oxidation flame until it mixes with, and is thoroughly dissolved by the borax bead.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous

The arsenides and sulphides, before being examined, should be roasted, and then heated with the borax bead.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous

The borax bead, in the reduction flame, is grey, turbid, or completely opaque from the reduced metallic particles.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous