Sulphur in wool, fur, and hair, reagents for detection of, 26
Sulphuric acid, manufacture of, 50
" " " by contact process, 52
" " " by lead chamber process, 51
Sumach, 99
Tannins, 99
Tincal, 59
Tiza, 59
Toluene, 90
Toluidine, 91
Turmeric, 80, 83, 85, 87
Twaddell hydrometer degrees, 31
Ultramarine blue, 81
Ultramarine green, 81
" rose-coloured, 81
Valency, 71
Vegetable fibres. _See_ Fibres.
Veneering process, 66
Vermilline scarlet, 91
Vitriol. _See_ Sulphuric acid.
Water, 29
" boiling of 31
" boiling-point of, effect of dissolved salts on 36
" boiling-point of, effect of increase of pressure on, 35
" chlorides in, detection of, 47
" composition of, 29
" contamination of, by factories, 45
" copper in, detection of, 46
" decomposition of, by potassium, 25, 30
" filtration of, 47
" hard, 41, 42
" " Clark's soap test for, 43
" " softening of, 41
" " waste of soap by, 43
" hardness, temporary and permanent, of, 42
" impurities in, 42
" " effect of, in dyeing, 42
" " ferruginous, 44
" iron in, detection of, 46
" latent heat of, 34
" lead in, detection of, 47
" lime in, detection of, 46
" magnesium in, detection of, 46
" purification of, 45
" purity of, tests for, 46
" soft, 40
" effect of carbonic acid in hardening, 40
" sulphates in, detection of, 24
Wood acid, 64
" destructive distillation of, 64
" spirit, 64
Wool, chrome mordanting of, 77
" dead: why it will not felt, 18
" dyeing, with coal-tar colours, 105
" felted, effect of boiling water on finish and strength of, 22
" felted, effect of stiffening process on finish of, 66, 103
" felting of, interlocking of scales in, 13
" fibre, 8
" " action of acids on, 23
" " " of alkalis on, 24
" " composition of, 22
" " curly structure of, 15
" " distinction between, and hair, 12, 14
" " growth of, 8
" " hygroscopicity of, 20
" " structure of, from diseased sheep, 19
" " sulphur in, reagents for detection of, 26
" grease, 100
" kempy, 19
" merino, 15
" mordanting, 75
" scouring, 101
" stripping of, 23
Woollen goods, indigo-dyed, recovery of indigo from, 24
" " mixed cotton and, separation of, 5
Xylenes, 90
Yellow colour, absorption spectrum of pure, 114
Yolk.
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