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Dyes obtained from natural products, such as plants and insects, have been used for decorative effect and as symbols of status for thousands of years. The mollusk-derived Roman purple, 6,6?-dibromoindigo, also called Tyrian purple, was remarkable for its fastness to light and washing; it was also an important mark of social distinction. The associated biblical blue holds great religious significance among observant Jews. In China, the emperor and empress wore yellow, the imperial ladies violet, and noblemen of the first grade blue. Explorers of the Americas came across many natural dyes, particularly dyewoods, not previously known in Europe. Native American peoples, such as Navajo and Hopi, were highly skilled dyers. In Europe the blue extracted from the woad plant was used for adornment, through the coloring of skin and later the dyeing of textiles.

Hi man!
For scope and employment of chemical engineers follow the link below
.The scope of chemical engineering more or less remains the same but only difference is that with the increase in the technologies in the field of medicines and Chemicals modification the demand for the chemical engineering and chemical engineers has been increasing day by day not only in the government sector but in the private sector as well so definitely in the upcoming days India has a lot of scope in the field of chemical engineers the only need is to know the right information where you could apply your knowledge for proper information I will suggest you to Google it it will provide you with all information thank you.