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DIOXIDES

Compounds containing two proportions of oxygen to one of baseas, for example, barium dioxide 2

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DIMETHYLANILINE

An oily derivative of aniline which boils at 192 degrees C., has a strong basic character, and is used in the synthetic manufacture of dyes. By a process of mild Oxidation it is converted into methyl violet, and by a process of reduction it yields the dye “malachite green.”

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DISULPHIDES

Compounds containing two proportions of sulphur to one of baseas, for example, rarbon disulphide.

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DYERS BROOM

Found in pastures and thickets in Southern Europe, Russian Asia, Southern Sweden, and some parts of Great Britain; contains two principles, one of which is a yellow colouring matter of crystalline character and another genistein, which can be obtained in the form of colourless crystals.

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DISINFECTANTS

Preparations that destroy in any way the infectants or causes of disease, or render them innocuous.

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DILL OIL

Distilled from the fruit of A net hum graveolens, contains limonene and carvol, has a sp. gr. of from 090 to 092, optical rotation + 70 degrees to 8o degrees, and is soluble in alcohol and ether. It is of pale yellow colour and characteristic odour, and is used in perfumery and for flavouring.

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DUROGLASS

A trade name for borosilicate resistance glassware.

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DIATHERMANOUS

A character of substances like rockcrystal which transmit heat as transparent substances transmit light.

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DRAGON

A red resin of several varieties secreted by the fruits of a number of palms of the genus Calamus draco, indigenous in Sumatra and the West Indies. It contans benzoic acid in combination, and is chiefly used for colouring mahogany varnishes, in preparing gold lacquers, in compounding dentifrices, and for staining marble a red colour.

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DIAZO GROUP

, as it exists, for example, in diazo benzene chloride.

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