Dyeing with Inorganic Compounds

Permanent hair dyes also include metal salt dyes, which produce a finely dispersed metal deposit on the hair. Metal oxides or sulfides may also be formed this process can be promoted by the addition of sulfur compounds [9, p. 240], A 

Metal salts can be used in two ways. First, pretreatment with a trihydroxyben-zene compound such as pyrogallol [87-66-1] is followed by treatment with an ammoniacal silver salt solution. This allows rapid dyeing due to the formation of metallic silver and oxidation products of the trihydroxybenzene derivative. If pre-treatment is performed with thiosulfate instead of a benzene derivative, the process yields unstable silver thiosulfate and finally black silver sulfide. 

In the second method, a metal salt solution (silver, lead, or bismuth less often nickel, cobalt, or manganese) is applied colloidal sulfur may also be added. Dyeing is based on (1) The reaction of the metal salts with the added sulfur and the sulfur in the hair keratin, which yields metal sulfides, and (2) The deposition of finely divided metals or metal oxides. With these products progressive coloration also is obtained. 

Metal salt dyes are no longer important in professional hairdressing, for three reasons  

2) In permanent-wave neutralization, bleaching, or oxidation dyeing, metal salts catalyze the decomposition of hydrogen peroxide used as oxidant. When the temperature rises, the liberated oxygen can make the hair brittle. 

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Type Sodium salt of a carboxylate polyelectrolyte Dispersant for fillers used in carpet backcoatings, dyes, pigments and clays particularly effective with inorganic compounds. 

However, these compounds and the fragments are not without their intrinsic problems and should not be used as is. Some examples of potentially problematic compounds include those with chemically reactive groups, dyes, and fluorescent compounds which interfere with assays, frequent hitters/promiscuous binders, and inorganic complexes (55). It is important, then, to a priori filter out such compounds or reagents which are practically useless from a drug discovery point of view. 

Rubber is vulcanised by treatment with sulphur chloride or by heating with sulphur. In most cases, however, rubber articles are made, not of pure vulcanised rubber, but of the latter mixed with various other substances, organic and inorganic. The organic substances more commonly used are brown and white factis, fatty oils, oxidised oils, waxes, mineral oils, paraffin wax or ceresine, resin or resin oils, bitumens, tar, pitch, starch, and artificial dyes. Very many inorganic compounds may be added either as fillers or to give colour, e.g., talc, kaolin, asbestos, chalk, gypsum, lime. 

A.F. Mingotaud, C. Mingotaud and L.K. Patterson, Handbook of Monolayers. (Contains about 1300 examples of x(A), or rclaj curves, with references and some experimental information. Only for aqueous subphases. Not critically evaluated.) Volume 1, long chain amphipolar aliphatic compounds, phospholipids, macro-cyclic ctnd inorganic compounds Volume 2, dyes, polymers, steroids, amino acids and polypeptides, and other natural products. Academic Press (1993). 

The most important reactions of 4-arylazo-2-pyrazolin-5-ones are those with various salts to form metal complexes. These products are of great importance in the dye industry and will be discussed more completely in the section devoted to dyes. Chromium complexes are prepared by reaction of a 4-arylazo-2-pyrazolin-5-one with inorganic compounds213,1457 including chromium sulfate475 and chromium trifluoride,1616 with organic chromium compounds, such as chromium... 

Colorants. Addition of soluble dyes and the dispersion of pigments are the methods used to provide plastics with desired colours. Dyes include azo compounds, anthraquinones, xanthenes and azines whereas a variety of inorganic compounds are used as pigments such as iron oxides, cadmium and titanium dioxide. 

CHG is a cationic moiecuie that is generaiiy compatible with other cationic molecules, such as the quaternary ammonium compounds [2], Some nonionic substances such as detergents, aithough not directiy incompatible with CHG, may inactivate the antimicrobiai properties of CHG, depending upon the compound and concentration leveis. CHG is incompatibie with inorganic anions, except in very dilute concentrations, and may aiso be incompatible with organic anions present in soaps containing sodium lauryl suifate, and with a number of pharma-ceuticai dyes [3,4]. 

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