Archive | H RSS feed for this section

HYDROS

An abbreviated name for bydrosulphite of sodium, used as a decolourizing agent, by removal of iron compounds frum soap after the process of saponification is completed.

Comments are closed

HEMPSEED OIL

is obtained by pressing or extraction from hempseed, and is of faint green colour, nondrying in character, and turns brownishyellow upon standing. It has a sp. gr. of 0925 to 0928, a saponification value of about 1925, and an iodine value of 148. It is soluble in ether, benzol, and carbon disulphide, and is used for illuminating purposes and in making soft soaps, paints, and varnishes.

Comments are closed

HAILCRIS

A British white glass for making miners

Comments are closed

HEMATINE

A colouring matter prepared in tbe forms of crystals, paste, and liquor from logwood extract, and not to be confounded with the red colouring matter of blood corpuscles.

Comments are closed

HOP

The fruit of this plant contains a yellow, bitter powder named lupulin, of mixed constitution including a resin, a waxy body, and extractive matters, and when distilled with water it yields valerianic acid and a volatile oil. The real bitter principle is said to form about from 8 to 12 per cent, of the lupulin powder of which the hop fruit contains about 10 per cent., and includes an acid named humulon.

Comments are closed

HALOIDS

Salts composed of halogen elements with metals, such as sodium chloride and potassium iodide.

Comments are closed

HYDRASIINE

6NA white, poisonous alkaloid from the root of Hydrasiis canademis, used in medicine. By oxidation it yields hydrastinine which is also used in medicine; meltingpoint, I3.10 C.

Comments are closed

HYDROSULPHIDES

If potassium be heated in hydrogen sulphide gas potassium hydrosulphide is formed, hydrogen being at the same time set free H2S + K = KHS + H, and the same substance is produced in solution, by passing a current of hydrogen sulphide into a solution of potassium sulphide Hydrosulphides of the alkalies and aikaline earths are also termed sulphydrates. Sodium hydrosulphide can be obtained in the form of colourless needles, soluble in water, by treatuig calcium sulphide with sodium bisulphate.

Comments are closed

HOPOL POWDER

A proprietary preparation to make liquid metal polish by mixing with a turpentine substitute.

Comments are closed

HOLMIUM

Atomic weight, 1635. A recently discovered, very rare element of the yttrium group occurring in the mineral? thulium, gadoUnite, samarskitc, etc. Its com pounds are but little known.

Comments are closed