Lustrous pigments

New Developments Based on Non-Micaceous Systems. The class of single crystal lustrous pigments is not limited to the non-absorbing types like bismuth oxychloride and basic lead carbonate. Recent developments are absorbing pigments such as platelet-like graphite, laminar phthalocyanines and flaky iron oxides. These flakes... 

Bismuth oxychloride [7787-59-9]—Cl Pigment White 14, Cl No. 77163. A synthetically prepared white or nearly white amorphous or finely crystalline, odorless powder consisting principally of BiOCl. Bismuth oxychloride is synthetic pearl essence. It is used in Upstick, nail poHsh, eye makeup, and other cosmetics to produce a lustrous, pearly effect. 

A version of P.R.202 in a platelet form is obtainable by recrystallizing of the crude pigment from a polar solvent such as DMF in the presence of a thiol compound and sodium methoxide. The new form affords, for instance in PVC, the appearance of a lustrous copper bronze tone [27]. 

Synthetic or natural pigments used to achieve lustrous, brilliant, or iridescent color effects by interference on thin optical films are called nacreous or pearlescent pigments [5.190]—[5.194]. They were originally used to simulate the appearance of... 

Powders containing bismuth compounds have long been used for decorative purposes to generate a shiny luster or lustrous colors (e.g., facial cosmetic powder in ancient Egypt, imitation pearls made by coating glass and ceramic beads). Bismuth oxychloride [7787-59-9], BiOCl, Mr 260.4, was the first synthetic nontoxic nacreous pigment. It is produced by hydrolysis of acidic bismuth solutions in the presence of chloride ions. Precipitation conditions may be varied (concentration, temperature,... 

Natural pearl essence is isolated as a silky lustrous suspension from fish scales. The organic pigment particles in the suspension are platelet-shaped with a very high aspect ratio (0.05 pm x 1-10 pm x 20-50 pm), and consist of 75-97% guanine and 3-25% hypoxanthine (natural fish silver) [5.122, 5.123, 5.128, 5.130]. 

An all aqueous printing compound that provides a lustrous metallic print in a neutral off-white color. With pigment colors being added, unique metallic appearing prints can be achieved to give novelty prints with excellent durability. A variety of tints can be achieved by adding small amounts of concentrated colors. 

A thread viscose produced by the methods described above is very lustrous and this is looked upon as an undesirable property. Matt yams are therefore made by adding approximately 2 per cent by weight of titanium dioxide to the viscose solution before spiiming. Mass coloured yarns are finding increasing application. An insoluble finely divided pigment is in-... 

Other potential organic pigments are those that show metallic colours , such as the dithienyl pyrroles above, which form high melting (>300 °C) golden lustrous crystals. ... 

The first step in this investigation was to isolate the pigment from strawberry juice by the method described by Sondheimer and Kertesz (11). This method involved the saturation of the juice with salt and extraction with 1-butanol, then concentration of the butanol extract under vacuum and in a nitrogen atmosphere. The anthocyanin concentrate was then taken up with hydrochloric acid in anhydrous methanol, precipitated with ether, dissolved in 0.01% hydrochloric acid, and saturated with picric acid. The anthocyanin picrate crystallized out of this solution upon storage at 0° C. as lustrous reddish bronze prisms which were further purified by recrystallization. 

Nacreous pigment n. Translucent pigment which, when added to transparent coating material, creates a deep lustrous and pearlescent finish. Kirk-Othmer encyclopedia of chemical technology pigments-powders. John Wiley and Sons, New York, 1996. 

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