ties of pure, 5

Cholesterol, 100

Chrome mordanting, 78

Chrome orange, 84
" yellow, 84

Chroming, over-, 78

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.
"