With that logwood black fibre, anyone could argue
as to a considerable proportion of the dye rubbing, wearing, or washing
off. Thus, then, we have the second cause of the deterioration of the
black, for the colour could not go into the fibre, and so it was chiefly
laid or plastered on. You can also see that a logwood black hat dyer may
well make the boast, and with considerable appearance of truth, that for
the purposes of the English hat manufacturers, logwood black dyeing is
the most appropriate, _i.e._ for the dyeing of highly proofed and stiff
goods, but as to the permanent character of the black colour on those
stiff hats, there you have quite another question. I firmly believe that
in order to get the best results either with logwood black or "aniline
blacks," it is absolutely necessary to have in possession a more
scientific and manageable process of proofing. Such a process is that
invented by F.W. Cheetham (see Lecture VII. p. 66).
In the dyeing of wool and felt with coal-tar colours, it is in many
cases sufficient to add the solution of the colouring matters to the
cold or tepid water of the dye-bath, and, after introducing the woollen
material, to raise the temperature of the bath.
Pages:
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182