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This book has gaining increasing popularity. Therefore, I feel pleasure the Fourth Revised and Enlarged Edition of this book. In this edition more than 60 pages have been added. All chapters have been rewritten and two new chapters have been added. At the end of this book, some selected questions on dyes have been added which will make the book more interesting Contents- 1 . Introduction to Dyes 2 . General Information About Fibres and Dyeing Methods 3 . Classification of Dyes on the Basis of Mode of Application 4 . Chemical Classification of Dyes 5 . Colour and Chemical Constitution 6 . Chemistry of Dyestuff Intermediates 7 . Nitro Dyes 8 . Nitroso Dyes 9 . Azo Dyes 10 . Azoic Dyes (Ingrain Azo Dyes) 11 . Diphenylmethane Dyes 12 . Triphenylmethane Dyes 13 . Phthaleins 14 . Xanthene Dyes 15 . Heterocyclic Dyes 16 . Thioindigos and Indigos 17 . Anthraquinone Dyes 18 . Phthaloocyanines 19 . Sulphur Dyes 20 . Reactive Dyes 21 . Pigments 22 . Fluorescent Brightening Agents 23 . Non-Textile Uses of Dyestuffs 24 . Acridine Dyes 25 . Thiazole Dyes 26 . Ingrain Dyes 27 . Solubilised Vat Dyes 28 . Sulphurised Vat Dyes 29 . Lactone, Amino Ketone and Hydroxy Ketone Dyes 30 . Indamines and Indophenols 31 . Azines 32 . Oxazines 33 . Thiazines 34 . Cyanine Dyes 35 . Dyes for Synthetic Fibres 36 . Synthesis of Some Specific Dyes 37 . Important Question