Research Results For 'Alumina'

COBALT-BLUE

Cobalt-blue is a compound of alumina and oxide of cobalt, forming a beautiful blue coloured pigment often used in the arts.
Research Cobalt-Blue

Green Paints are for the most part compounds of copper and of chromium. The best known greens are the following: Bremen green, or verditer, consisting mainly of a basic carbonate of copper. Brunswick green, a hydrated oxychloride of copper; but the name is sometimes given to a hydrated basic carbonate, also known as mountain green. Chrome and emerald green are oxide of chromium. Emerald green is also used as synonymous with Schweinfurt green. English green is a mixture of Scheele's green with gypsum. Guignets green is oxide of chromium prepared in a peculiar way. Hungary green is a kind of malachite found in Hungary. Rinman's green is obtained by heating zinc oxide with a cobalt compound. Saxony green is an indigo colour used in printing. Scheele's green is arsenite of copper, and Schweinfurt green, Veronese green, and Vienna green, are also compounds of arsenic and copper. Verdigris is a hydrated basic carbonate of copper, often seen in copper coins. Besides these are green colours derived from plants. Of these may be mentioned chlorophyll, the green colour of leaves: sap green, the juice of Rhamnus catharticus or buckthorn, made into a green lake with alumina; Chinese indigo-green, etc.
Research Green Paint

OCHRE

Ochre is a yellow earth pigment derived from sands and clays around the world. Ochre consists of a mixture of silica, alumina and hydrated iron oxide. Ochre is one of the oldest pigments known to man, and produces a dull brownish-yellow effect which is stable, permanent and fast to light.
Research Ochre

ABC PROCESS

The ABC Process was a method of purifying sewage which derived its name from the articles used: sulphate of alumina, blood, charcoal and clay.
Research ABC Process

ALUMINA

Alumina is the oxide of aluminium. It is a soft, fluffy white powder which becomes transparent when mixed with oil. In painting, alumina is used as a suspending agent with heavy pigments to prevent their settling.
Research Alumina

ALUMINIUM

Aluminium is a bluish-silver-white, malleable, ductile, light, trivalent metallic element with good electrical and thermal conductivity, high reflectivity, and resistance to oxidation and is the most abundant metal in the earth's crust occurring always in combination. It has the symbol Al. Aluminium was discovered in 1827, but nowhere found native, although its oxide, alumina is abundantly distributed. The minerals bauxite and cryolite are sources of aluminium, but the chief source is the pure oxide, from which the metal is obtained by means of a strong electric current. It forms several useful alloys with iron and copper; one of the latter (aluminium gold) much resembles gold, and is made into cheap trinkets. Another, known as aluminium bronze, possesses great hardness and tenacity. Spoons, tea and coffee pots, dish-covers, musical and mathematical instruments, trinkets, etc, are made of aluminium, as are aircraft parts on account of its light weight.
Research Aluminium

ALUMINIUM OXIDE

Aluminium oxide is the oxide of aluminium popularly known as alumina.
Research Aluminium Oxide

ALUNDUM

Alundum is a form of alumina (aluminium oxide) used in the manufacture of thermionic valves for insulating the cathode heater from the tubular cathode.
Research Alundum

EARTHS

Earths is a term applied to certain tasteless, inodorous, dry, uninflammable, nonvolatile, insoluble substances, difficultly fusible, and of a moderate specific gravity, which constitute by far the greatest part of the gravel and soil that go to make up the mountains, valleys, and plains of our globe. They include lime, baryta, strontia, magnesia, alumina, etc. The earths were regarded as simple bodies until Sir Humphry Davy proved them to be compounds of oxygen with metals.
Research Earths