The oil-bath was prepared by treating olive-oil with
nitric acid. This preparation, invented by Hirn, was applied since 1846
by Braun (Braun and Cordier). Since 1849, Gros, Roman, and Marozeau,
of Wesserling, printed fine furniture styles by block upon pieces
previously taken through sulpholeic acid. When the pieces were steamed
and washed the reds and roses were superior to the old dyed reds and
roses produced at the cost of many sourings and soapings. Certain makers
of aniline colors sold mixtures ready prepared for printing which were
known to contain sulpholeic acids. There was thus an idea in the air
that sulpholeic acid, under the influence of steam, formed brilliant and
solid lakes with coloring matters. These facts detract in nothing from
the merit of M. Horace Koechlin, who combined these scattered data
into a true discovery. The original process may be summed up under the
following heads: Printing or padding with an aluminous mordant, which is
fixed and cleaned in the usual manner; dyeing in alizarin for reds with
addition of calcium acetate; padding in sulpholeic acid and drying;
steaming and soaping. The process was next introduced into England,
whence it returned with the following modifications; in place of
olive-oil or oleic acid, castor oil was used, as cheaper, and the number
of operations was reduced. Castor oil, modified by sulphuric acid, can
be introduced at once into the dye-beck, so that the fixation of the
coloring matter as the lake of a fatty acid is effected in a single
operation.
Pages:
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132