Purple pigments

Purple Pigments. Methyl violet is the most commonly used purple pigment. It is also widely used for toning black inks. In packaging, although very expensive, Carbazole and Vat violets are used where permanence and resistance properties are needed. 

The magnificent purple pigment referred to in the Bible and known to the Romans as Tyrian purple after the Phoenician port of Tyre (Lebanon), was shown by P. Friedlander in 1909 to be 6,6 -dibromoindigo. This precious dye was extracted in the early days from the small purple snail Murex brandaris, as many as 12000 snails being required to prepare 1.5 g of dye. The element itself was isolated by A.-J. Balard in 1826 from the mother liquors remaining after the crystallization of sodium chloride and sulfate from the waters of the Montpellier salt marshes ... 

Berke, H. (2007), The invention of blue and purple pigments in ancient times, Chem. Soc. Rev. 36, 15-30. 

Berke, H. (2002), Chemistry in ancient times The development of blue and purple pigments, Angewandte Chemie. Int. Ed. 41(14), 2483-2487. 

During the synthesis of H2[pz((V-Me2)8], (101) the seco-pz (158), a purple pigment, was isolated as a minor side product (40). The seco-pz was formed as a result of the desymmetrization of macrocycle 101 generated by the oxidation of one of the pyrrole rings during the work up, accompanied by the loss of the Mg(II) cation (Scheme 28). 

Purple permanganate ion, 15 597 Purple pigments, 7 349-350 for inks, 14 318 Pusher centrifuges, 11 392 Pusher furnaces, 12 289-290 Push-pull coupler device, 13 422 Push-pull rods/barrels, 24 59 Putrescine, 2 79... 

Plants with the chlorophyll usually hidden by a brown, red, or purple pigment, always with a multicellular body and -------------------- sexuality. 

S(Pi) = Red/purple pigment, if enough iron and biotin are present L = Lemon-shaped... 

Chromobacterium violaceum is commonly found in soil and water and produces a purple pigment named violacein (Figure 32), which is water insoluble and has an antibacterial activity. Violacein production is regulated by Cvil—CviR quorum sensing system with C6-HSL in C. violaceum,316... 

Yellow stain based on Pr oxide (%) Orange stain based on Y oxide (%) Light purple pigment based on Nd oxide (%) ... 

Pigment components have also been identified from their IR spectra. Figure 6 shows the spectrum obtained from a purple pigment removed from... 

Figure 6. Spectrum obtained from a purple pigment sample from MS 965 (2100 scans). Abbreviations are as...

The acidophilic bacterium Pseudomonasphenazinium has been observed to produce the water-insoluble purple pigment iodinine (phenazine-1,6-diol 5,10-dioxide). 

Bryaquinone (136) is the principal purple pigment in the heartwood of Brya ebenus. It was isolated together with a small amount of the 4-desoxy analog (75JCS(P1)1113). 

Chrysiasis, a gray, blue, or purple pigmentation on light-exposed skin areas, is a complication that tends to be permanent (SEDA-20, 210). In one series of 40 patients receiving sodium aurothiomalate it appeared in 31 (65). 

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