Gold, colour

The trityl radical (gold-coloured) is readily oxidized to peroxide (white) the comparable 2,4,6-tri-(tert-butyl)phenoxy radical (blue) in, e.g., cyclohexane was applied by Paris et al." to so-called free radical titration (either potentiometric or photometric) of oxygen or antioxidant (the latter by hydrogen abstraction). 

The alkalides. The first crystalline alkalide to be prepared in this manner was [Na+(2.2.2)].Na. This salt is obtained as shiny, gold-coloured crystals (Dye etal., 1974). The 23Na nmr spectrum yields a narrow upfield signal for the Na- ion (Dye, Andrews Ceraso, 1975) the X-ray structure indicates close-packed sodium cryptate cations with Na" anions occupying octahedral holes between the cryptate layers (Tehan, Barnett Dye, 1974). 

The gold paint with which lamp-posts and other ornamental metalwork are decorated contains no gold, because of its prohibitive expense. The reflective gold-coloured substitute is sodium tungsten bronze, Nao.3W03. So why is NaojWOs reflective ... 

Mixed valency of this sort is the cause of the reflective, gold colour of Nao.3W03. In this system, like the MnfTc ion described above, electrons are excited optically following photon absorption from a ground-state electronic configuration to a vacant electronic state on an adjacent ion or atom. The colour is caused by a photo-effected intervalence transition between adjacent WVI and Wv valence sites ... 

The quest for artificial gold has never ended. The Swedish writer August Strindberg convinced himself that he had made it alchemically in 1894 but this at least was one claim susceptible to chemical disproof, for his gold turned out to be a gold-coloured compound of iron a variety of fool s gold. 

Dibenzyl telluride, (C6H5.CH2)2Te, forms a compound with platinum chloride, PtCl2.2(C6H5.CH2)2Te, an orange powder which decomposes in solution with the separation of tellurium, platinum and dibenzyl, but on rapid crystallisation from chloroform is obtained as a microcrystalline powder of greenish-gold colour which darkens and softens at 115° to 120° C.2... 

Zirconium Zr 40 Martin Klaproth Germany Arabic word "zargun" meaning "gold colour"... 

If carbon monoxide is passed over metallic nickel or iron in a fine state of subdivision produced by reducing their oxides, volatile compounds are formed of the formulx Ni(CO)4, and Fe(CO)5 on exposing the latter to light gold-coloured crystals are formed, of the formula Fe2(CO )7. The nickel carbonyl boils at 43°, and the iron penta-carbonyl at 103° di-ferro-hepta-carbonyl decomposes... 

APPEARANCE. Moth 20 mm in size, with grey front wings and darker, wavy transverse lines there is a wing mark in the apical region - like a dark mirror with three gold-coloured lines in it. 

Scissile ore, having seams of gold-coloured copper. 

Copper tinctures with gold-colour by chemical art. Alchemical gold. 

Natural yellow copper, gold-coloured copper, cleaving to brittle Mansfield stone. 

A polished ashen stone, overlaid with gold colour, and in which a stone like the Chama is found. 

Tellinites, precisely similar to the molluscs, called Tellina, overlaid with a gold-coloured covering. 

Conchites, similar to a bivalve shell, with a gold-coloured armature. Another variety of the Snail stone. 

A nugget in a gold-coloured pyrites, similar to natural cinnabar. 

Tawny-coloured Quicksilver ore in which there are layers of gold coloured pyrites. 

Next to this species are the Chrysoberylli, a little paler, exhibiting an effulgence in a gold colour. They glitter more faintly, and are surrounded by a cloudy golden. 

White, pyramidal Fluors, transparent at the top, in a white metallic rock, which are overlaid with saccharine matter, like grains of coriander in appearance. They also contain bright particles, as it were, gold-coloured pyrites. 

Triangular transparent Fluors, covered with gold-coloured pyrites. 

Opaque, square Fluors, sprinkled right at the top with, as it were, gold-coloured sand. 

Long, white, pellucid, sexangular Fluors, which in one part are like a white metallic stone, covered as it were with coriander grains, and which are sprinkled with grains of gold-coloured pyrites. 

White Fluors, like thorns of the bramble, rising out of gold-coloured pyrites, and to which, as it were, numberless scales are affixed. 

A grey Stone, covered with gold-coloured armature, containing a kind of lynx stone. 

Another, like the third, with a gold-coloured armature. 

Compendium of the Confection of the Stone. Rosaries says Take gold-coloured Olitet, and therewith dissolve your Stone after the first fixation two or three times three or four days, in order that we may excuse you much solution and coagulation, so that you may have done in thirty days. 

Various kinds of Pyrites are found in our mines-Silver Colour, almost Gold Colour, True Gold Colour like Galena, Ashen Colour, and Iron Colour. 

True Gold-coloured Pyrites has a larger proportion of Sulphur. It is sometimes combined with the fourth species. It is brilliant and pleasant to the sight. It abounds in Bohemia and Misnia. 

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