Organic dyes extracted from plants, insects, and shellfish have been used for millennia in dyeing textiles and manufacturing colorants for painting. The economic push for dyes with high tinting strength, directly related to high extinction coefficients in the visible range, historically led to the selection of substances that could be used at low concentrations. But a desirable property for the...

A 39-year-old female presented with a 20-year history of a polymorphic, urticated and papular eruption occurring on sun-exposed sites but sparing the face and hands. She had been referred because, after many years of sunscreen use, she had begun to develop an exacerbation of her rash at sites of application of a new sunscreen, including, for the first time, the face. She described an urticated ...

Many artificial synthetic colorants, which have widely been used in foodstuff, dyestuff, cosmetic and pharmaceutical manufacturing processes, comprise various hazardous effects. To counter act the ill effect of synthetic colorants, there is worldwide interest in process of development for the production of pigments from natural sources. The utilization of natural pigments in foodstuff, dyestuff...

Research on biosorption of organic dyes is an important subject for the development clean technologies treatment textile wastewater. In this work, process sorption four different natures, namely Basic Violet 10 (BV10), Acid Red 27 (AR27), Direct Blue 151 (DB151) and Reactive 4 (RV4) onto two composts, pine bark compost municipal solid waste compost, has been studied. For this, kinetics equilibr...

Synthesis of novel colorants for dye-sensitized solar cells and use of greener protocols for heterocyclic synthesis Page 79 3.

This paper discusses colorants found in Tumulus MM, the tomb of King Midas or his father, at Gordion, capital Phrygian kingdom. Chromophores, colorants, and auxiliaries are preserved largely independent textiles they once colored. The MM now fragmentary due to degradation processes that occurred inside chamber. For DHA 26 (Vienna, Austria, 2007), we discussed a group golden-yellow fragments fro...