mine yellow N, Diamine gold, Diamine fast yellow B,
Diamine orange B, Diamine grey G, Diamine rose B D, Diamine scarlet S,
Diamine scarlet B, Diamine scarlet 3 B, Diamine red 5 B, Diamine fast
red F, Diamine Bordeaux B, Diamine Bordeaux S, Diamine violet N,
Oxydiamine violet B, Diamine blue R W, Diamine black H W, Diamine steel
blue L, Diamine dark blue B, Union black S, Oxydiamine black D,
Diaminogene extra, Diaminogene B, Diamine brown M, Diamine brown 3 G,
Diamine green B, Diamine green G.

3. Dye-stuffs producing on cotton more or less different shades than on
silk. This group comprises Diamine blue C B, Diamine blue B G, Diamine
blue B X, Diamine azo blue 2 R, Diamine blue 3 R, Diamine blue black E,
Diamine black R O, Oxydiamine black S O O O, Diamine brown V, Diamine
brown B, Diamine bronze G. Cotton brown N produces on silk darker shades
than on cotton.

Of course this classification cannot be taken as absolutely correct, as
by raising or lowering the temperature during the dyeing process or by a
larger or smaller addition of soap or Glauber's salt (common salt,
phosphate of soda), the dye-stuffs are more or less influenced in one or
the other direction. Diamine violet N, for instance, when dyed with an
increased addition of soap would dye the cotton somewhat lighter, but at
the same time leave the silk perfectly white.

=Topping with Basic and Acid Dye-stuffs.=--As in very few cases only the
desired shade can be obtained in the first instance by bottoming with
direct colours, topping generally has to be resorted to. This is best
done with basic dyes, in some cases also with acid dye-stuffs in cold or
tepid bath with addition of sulphuric acid, hydrochloric or acetic acid.
The use of acid dye-stuffs is restricted to cases where the silk alone
is to be shaded. In most cases basic dye-stuffs are made use of, which
dye silk and cotton the same shade and deepen the shade of the cotton if
the latter has a sufficiently good bottom, thus giving the goods a
better and fuller appearance.

It is not advisable to employ basic and acid dye-stuffs in the same bath
except when the quantities of either class are very small. Should it be
necessary to dye with large quantities of both classes, the acid
dye-stuffs are first dyed in a tepid acid bath and then the goods are
topped with the basic dye-stuffs in a fresh cold bath with the addition
of a little hydrochloric or acetic acid.

Of the basic dye-stuffs which are availabl