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  • Dyes and dyestuffs are available for applications on different types of materials like textile, paper as well as for painting and printing. Different types of the same material like different types of fabrics require dyes of different composition to colour them.
  • Different varieties of dyes are available in the market like sun dyes and transfer dyes, landscape dyes and many more. One can find all these different types of dyes with dyes and dyestuffs manufacturers.
  • A Greek artifact known as the Stockholm Papyrus details dyestuffs and techniques in almost a recipe fashion as it was practiced Egypt in the third and fourth centuries CE. Venice was one of the major early centers for imported dyestuffs, supplying Brazilwood (Caesalpinia sappan) from the East, lac (another insect dye) and indigo from India from the fifteenth century CE onward.
  • The preparation and use of dyestuffs is one of the oldest of human activities, as evidenced by the unearthing of ancient fabrics at archeological sites, as well as accounts in the Bible and works of classical antiquity. A range of synthetic dyestuffs appears in Britain and France.
  • A series of monoazo disperse dyestuffs derived from naphthalimide were prepared. 4-Amino-N-methyl (alternatively N-ethyl, N-propyl, N-butyl) derivatives of naphthalimide were utilised as the diazo components and -naphthol, N,N-diethyl-m-toluidine, and p-aminoacetophenone constituted the coupling components.
  • Unmodified polyester fibres can only be dyed with disperse dyestuffs either with the aid of carriers at 100oC (no longer desirable due to environmental limitations), or at elevated temperatures (130oC for the exhaustion processes and 210oC for the thermosol processes).
  • PAC is prepared utilizing the aluminum chloride wastewater as a raw material through the controlled release membrane reactor (CRMR) system and to evaluate their performances on the sedimentation to four different dyestuffs, such as Titan Yellow (T.Y.), Methyl Orange (M.O.), Food Yellow (F.Y.) and Procion Red (P.R.).
  • The use of Eastman Kodak ChromagramŽ2 sheet for the separation of the various dyestuffs used in the compounding of inks which has developed into one of the more useful techniques for the identification of inks. Both silica gel and cellulose ChromagramŽ sheets are now commonly used with a variety of eluent systems.
  • The dyestuffs from three groups of visually similar wool samples (12 reds, 18 blues, and 12 blacks) have been characterized by five different methods. Mounted fibers were examined nondestructively with white light microscopy, UV fluorescence microscopy, and microspectrophotometry; after dye extraction, solution spectrophotometry and thin-layer chromatography were used.
  • Chemical Industry is an important constituent of the Indian economy. Its size is estimated at around US$ 35 billion approx., which is equivalent to about 3% of India's GDP. The total investment in Indian Chemical Sector is approx. US$ 60 billion and total employment generated is about 1 million. The Indian Chemical sector accounts for 13-14% of total exports and 8-9% of total imports of the country.
  • Chemical industry in India is amongst the largest globally and ranks 6th worldwide and 3rd across Asia. Closure of a number of manufacturing units in the developed nations due to stringent environmental regulations has led to further growth of the dyestuff industry in India. Textile constitutes the major proportion of demand for dyestuff; however, requirements from other manufacturing sectors such as paints, paper and leather has given the market further impetus.

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