Coloring agents lakes

An initial use of reflectance spectroscopy in the characterization of pharmaceutical solids concerned studies of the stability of coloring agents in tablet formulations. With the description of a device that enabled the surface of intact tablets to be studied [14], the photostability of various dyes and lakes in tablets was followed [15,16]. Exposure of formulations to both normal and exaggerated light conditions was investigated, and the kinetics of the photodegradation evaluated. In most cases, the photoreactions appeared to follow first-order kinetics. 

B Rose liquid Carmine Carmine (Coccus cacti L.) CCRIS 1204 Cochineal (Coccus cacti L.) Cochineal extract lake EINECS 215-724-4 FEMA No, 2242 FEMA No. 2330. Aluminum lake of the coloring agent, cochineal cochineal Is a natural pigment derived from the dried female insect Coccus cacti dyes, inks, indicator in chemioal analysis, coloring food, medicine. Acefo Co/p, Greet R.W. Co. Penta Mfg. Warner-Jenkinson. 

IMttition Aluminum lake of the coloring agent, cochineal cochineal is a natural pigment derived from the dried female insect Coccus cacti Empirical CjiHaO,... 

In addition, polyester bottles may contain colorants in the form of pigments, dyes or lakes. The colorants may be dispersed or dissolved in the polymer or may be covalently bound to the polymer backbone. Polyester packaging, which may be collected for depolymerization, may include nucleators for enhanced crystallization, anti-slip agents, branching agents, anti-blocking agents and anti-stats. 

Since 1926 when the mineral )feerm te(Na2B40 4HzO)was discovered in Searle s Lake,Calif, it has been almost the sole source of borax in the USA. Kemite is first extracted with hot w which dissolves borax any silica in soln is pptd and the hot filtrate, after dilution, is treated with an oxidg agent to destroy coloring matter. After further filtration, borax is obtd by crystn(Refs 3 ... 

Several investigations on the photostability of certified dyes have been conducted. As with drugs, the photostability of the different colorants depends on test conditions employed (pH, temperature, and radiation intensity) (24) and the presence of excipients in the formulation (25-27). Colorants absorb both UV and VIS radiation. The UV radiation contributes significantly to fading. Hence, UV absorbers (28) and sunscreen agents (29-31) can be used to increase their colorfastness. It is interesting to note that lakes are similarly (32) or even less photostable (33) than the... 

Use Electroconductive and electroluminescent coatings, mordant in dyeing textiles, perfume stabilization, manufacture of fuchsin, color lakes, ceramic coatings, bleaching agent for sugar, stabilizer for certain resins, manufacture of blueprint and other sensitized papers, other tin salts, bacteria and fungi control in soaps. 

Cassulfon Laking Agent PF. [Hoechst Celanese/Colorants Surf.] Amine deriv. alkylating agent for aftertreatment of sulfur dyes to give improved wetfastness properties. 

USE Manuf porcelain, pottery, bricks, Portland cement ultramarine, color lakes, refractory mortar plaster material, filler for paper electric and heat insulators clarifying liquids drying and emollient agent. therap cat Adsorbent. 

Uses Reinforcing agent, extender, pigment in reinforced plastics, dental cements, glass industry, rubber, wire and cable insulation paint filler/extender mfg. of semiprecious stones, enamels, colored lakes catalyst in refining petroleum filler in rubber, shoe soles,... 

Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of NOx and SOx Uses Natural flavoring agent for pharmaceuticals colorant for foods, medicines, toiletries mfg. of red and pink lakes... 

China clay n. Al203-2Si02-2H20. Pigment white 19 (77005). A complex hydrated aluminum sihcate produced by the breakdown of the mineral feldspar. The finest grades are used by the color and paint trades - often under proprietary names -and are utilized as a base for lakes and as an extender and anti-settling agent in paints. See aluminum silicate. Also known as kaolin. 

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