Colouration consistency

External Characters.—Note is made especially of the colour, consistency, homogeneity, odour and taste of the product with practice, useful conclusions with regard to the quality can then be drawn. 

A. When sampling is planned complete information about the type of soil, colour, consistency, texture, sampling horizon, drainage conditions, type of vegetation, weather conditions and human activity should be available. 

Chrome-Alumina Pink. A ceramic colour consisting principally of CrjOj, AI2O3 and ZnO when used as a glaze stain, the glaze should contain ZnO and little, if any, CaO. It is recommended that, for use under-glaze, the glaze should be leadless. The colour depends on diffusion of Cr into the insoluble AI2O3 lattice and is normally stable up to 1300 C. 

Venetian Red. A colour consisting chiefly of ferric oxide. 

In 2002, the automotive market accounted for around a quarter of total ABS consumption. The ABS automotive applications market has been growing more slowly in recent years, particularly in the more developed regions such as Western Europe and North America. This trend is due to growing competition from other polymers such as polypropylene and unsaturated polyesters. ABS has however benefited from developments of continuous mass processing technology, which has meant enhanced colour consistency and eliminated the need for painting. The process produces low-gloss products, a desirable feature for applications in the automotive sector. 

In fact, each linear polarizability itself consists of a sum of two temis, one potentially resonant and the other anti-resonant, corresponding to die two doorway events, and D, and the window events, and described above. The hyperpolarizability chosen in equation (B1.3.12) happens to belong to the generator. As noted, such tliree-coloiir generators caimot produce Class I spectroscopies (fiill quadrature with tliree colours is not possible). Only the two-colour generators are able to create the Class I Raman spectroscopies and, in any case, only two colours are nomially used for the Class II Raman spectroscopies as well. 

Weigh out accurately about 2 g. of glycine, transfer to a 250 ml. graduated flask, dissolve in distilled water, make up to the mark, and mix well. Transfer 25 ml. of the solution to a conical flask, add 2 drops of phenolphthalein, and then again add dilute sodium hydroxide very carefully until the solution is just faintly pink. No v add about 10 ml. (/. ., an excess) of the neutralised formaldehyde solution the pink colour of the phenolphthalein disappears immediately and the solution becomes markedly acid. Titrate with AI io sodium hydroxide solution until the pink colour is just restored. Repeat the process with at least two further quantities of 25 ml. of the glycine solution in order to obtain consistent readings. 

Transfer 30 g. of the hydrochloride to a 500 ml. separatory funnel, add 100 ml. of water and shake until a thin paste of uniform consistency is obtained add 10 per cent, aqueous sodium hydroxide solution in the cold with shaking until the whole mass has become bright green (the colour of the free base) and the mixture has an alkaUne reaction. Extract the free base by shaking with two 60 ml. portions of benzene (1). Dry the combined benzene extracts with a Uttle anhydrous potassium carbonate, and filter into a distiUing flask fitted with a water condenser. Distil off about half of the benzene, and pour the residual hot benzene solution into a beaker. Upon cooUng, the p-nitrosodimethylaniUne erystallises in deep green leaflets. Filter these off and dry them in the air. The yield of p-nitrosodimethylaniUne, m.p. 85°, from the hydrochloride is almost quantitative. 

Colour Index, and its Additions and Amendments, 3rd ed.. Society of Dyers and Colourists, London, and American Association of Textile Chemists and Colorists, Durham, N.C. It now consists of seven volumes. The Colourindex was originally written by and for the textile industry, but pigments are receiving increasing attention. 

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