Organic pigments color compounding

Of all synthetic organic pigments, the azo compounds are by far the most important, making up 48% of the total. Some 66 million lb are made each year in the U.S. Second in importance are the phthalocyanines, produced at the 33 million lb level. By color, red, blue, and yellow pigments are all equally important. 

Juices extracts (liquorize), spirits (orange, lemon), syrups (black currant), tinctures (ginger), and aromatic waters Mineral pigments (iron oxides), natural colorants, anthocyanins, carotenoids, chlorophylls riboflavine, red beetroot extract, and caramel synthetic organic dyes azo compounds... 

The development of modern organic pigments started with the synthesis of dyestuffs for the textile industry. The period up to 1900 was characterized by the discovery and development of many dyes derived from coal-tar intermediates. Rapid advances in color chemistry were initiated after the discovery of diazo compounds and azo derivatives (shown to be largely hydrazone derivatives). The wide color potential of this class of pigments and their relative ease of preparation led to the development of azo colors, which represent the largest fraction of manufactured organic pigments. 

The pigment is a mixture of organic and inorganic compounds bonded by hydrogen that, in addition to its spectacular color, has an exceptional durability. The color still remains on a variety of Maya artifacts and architecture. It is resistant to natural acids, alkalis, solvents, heat, and vegetation. Maya blue is resistant to color loss after centuries in the tropical rainforest of the Maya heartland. 

Pigments used to color polypropylene, as used also in other polymers, are organic or inorganic compounds. They are usually employed as concentrated master batches dispersed in a carrier resin. The carrier resin may be based on polypropylene or another polymer. The final pigment concentration, in the end product is in the range of 0.1-2.0% depending on the color sought. 

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