CHAPTER LVII. LICHEN COLOURING MATTERS 380 Archil—French Purple—Cudbear—Litmus. CHAPTER LVIII. RED WOOD LAKES 384 CHAPTER LIX. THE COLOURING MATTERS OF SANDALWOOD AND OTHER DYE-WOODS 388 CHAPTER LX. BLUE LAKES 390 Indigo—The Constituents of Indigo. CHAPTER LXI. INDIGO CARMINE 394 Indigo Mills—Blue Lake. CHAPTER LXII. THE COLOURING MATTER OF LOGWOOD 398 Logwood Extract—Kohlrausch’s Process for Obtaining Concentrated Extracts of Colouring Matters and Tannins. CHAPTER LXIII. GREEN LAKES 409 Chlorophyll—Sap Green—Chinese Green, Lokao —Charvin’s Green. CHAPTER LXIV. BROWN ORGANIC PIGMENTS 414 Asphaltum—Sepia. CHAPTER LXV. SAP COLOURS 416 CHAPTER LXVI. WATER COLOURS 419 Moist Water Colours. CHAPTER LXVII. CRAYONS 423 Crayons for Earthenware. CHAPTER LXVIII. CONFECTIONERY COLOURS 427 CHAPTER LXIX. THE PREPARATION OF PIGMENTS FOR PAINTING 429 Paint Mills. CHAPTER LXX. THE EXAMINATION OP PIGMENTS 434 Mineral Pigments—Examination with the Blowpipe —Reactions of the White Pigments—Reactions of the Yellow Pigments—Reactions of the Red Pigments—Reactions of the Blue Pigments —Reactions of the Green Pigments—Reactions of the Brown Pigments—Reactions of the Black Pigments. CHAPTER LXXI. EXAMINATION OF LAKES 445 Reactions of the Organic Colouring Matters. CHAPTER LXXII. THE TESTING OF DYE-WOODS 449 The Colorimeter. CHAPTER LXXIII. THE DESIGN OF A COLOUR WORKS 457 CHAPTER LXXIV. COMMERCIAL NAMES OF PIGMENTS 460 APPENDIX. THE CONVERSION OF METRIC INTO ENGLISH WEIGHTS AND MEASURES —CENTIGRADE AND FAHRENHEIT THERMOMETER SCALES 469 INDEX. CHAPTER I. INTRODUCTION.