Clark’s soap test, 43

Coal-tar, 90
  " yield of valuable products from, 90

Cochineal, 75, 76, 82, 83, 99

Coerulein, 90

Colour, absorption spectrum of pure blue, 114
  " absorption spectrum of pure yellow, 114
  " acids, 77
  " bases, 77
  " nature of, 107

Coloured substances, spectra of, 112

Colours, acid, mordanting of, 74
  " basic, 75
  " classification of, 79
  " complementary, 109
  " mixed, spectra of, 115
  " pigment, 110
  " primary, 110
  " spectral, 110

Conditioning establishments, 21

Congo red, 71

Copper salts, dissolving, in iron pans, 39
  " wet method of extracting, 38

Corrosion caused by fatty acids, 35

Cotton and woollen goods, separation of mixed, 5

Cotton fibre, action of basic zinc chloride on, 5
  " composition of, 3
  " dimensions of, 2
  " stomata in cuticle of, 2
  " structure of, 1

Cotton-silk fibre, 3
  " " composition of, 3

Crookes’ heat-indicating paint, 107

Cudbear, 86

Cupric ammonium solution, action of, on cellulose, 5

Curcumin, 87

Dextrin, 4

Dyeing felt hats deep black, 106
  " " effect of stiffening and proofing process in, 65, 103
  " of wool and felt with coal-tar colours, 105
  " of wool and fur, 100
  " power of coal-tar dyestuffs, 93
  " with mixed coal-tar colours, 106

Dyestuffs, adjectiv, 83, 99
  " azo, 98
  " classification of, 79
  " coal-tar, 90
  " " dyeing power of, 93
  " " yield of, 91
  " mineral, 83
  " monogenetic, 81
  " pigment, 83
  " polygenetic, 82
  " substantive, 83
  " " artificial, 89
  " " natural, 85

Equivalence, law of, 49

Fats, decomposition of, by superheated steam, 35

Felt, dyeing, deep black, 106
    " " with coal-tar colours, 105

Felting, dilute acid for promoting, 22
  " effect of water in, 21
  " fur, 15
  " interlocking of scales in, 13
  " preparation of fur for, 18
  " unsuitability of dead wool for, 18

Fibre, cotton. See Cotton.
  " cotton-silk. See Cotton-silk.
  " flax. See Flax.
  " jute. See Jute.
  " silk. See Silk.
  " wool. See Wool.