ering the fibre in the least, and not turning green during storage.
Diaminogene B and Diaminogene extra are mostly used for this purpose,
the former for jet blacks, the latter for blue-black shades.

Proceed as follows: Enter the boiled off and acidulated goods in a
boiling bath as concentrated as possible, charged with 16 oz. Glauber's
salt per 10 gallons liquor, and 1 lb. acetic acid per 100 lb. dry goods.
For jet black add for 100 lb. satin, 6 to 8 lb. Diaminogene, 1 to 2 lb.
Naphthylamine black D, 1/2 to 1 lb. Diamine fast yellow A or Diamine
green B; for very deep shades about 1/5 of the quantity of Diaminogene B
may be replaced with Diamine jet black S S. For blue black, 6 to 8 lb.
Diaminogene B, or 3 to 4 lb. Diaminogene B, and 3 to 4 lb. Diaminogene
extra. Dye for three-quarters to one hour at the boil, allow to cool in
the bath for about thirty minutes, then rinse, diazotise and develop.

Phenylene diamine (93 per cent.) serves for developing jet blacks mixed
with resorcine for greenish shades. Beta-naphthol is used for blue
blacks (1 lb. 5 oz. per 100 lb. of dry material, dissolved in its own
weight of soda lye, 75 deg. Tw.). The three developers may also be mixed
with each other in any proportions.

After developing soap hot with addition of new methylene blue, by
choosing a reddish or a bluish brand of new methylene, blue and black
may be shaded at will in the soap bath; finally rinse and raise with
acetic acid.

If properly carried out this process will give a black almost equal to
aniline black; but having, as already mentioned, the advantage of not
impairing the strength of the fibre, and not turning green during
storage.

As the dye-baths for blacks are charged with a proportionately high
percentage of dye-stuff for the first bath, and will not exhaust
completely, it is advisable to preserve them for further use.

For subsequent lots only two-thirds to three-fourths of the quantities
of dye-stuffs used for the first baths are required, which fact has to
be taken into consideration when calculating the cost of dyeing.

=Dyeing Shot Effects on Satin.=--Not all direct colours are equally well
adapted for the production of shot effects; those enumerated in Group
I. are most suitable for the purpose, and should be dyed with a larger
quantity of soap than is usual for solid shades, in order to leave the
silk as little tinted as possible. Dye-stuffs of the other groups may be
used if the dyeing is conduc