ne.

_Dark Plum._--Dye with 3 lb. Diamine brown V, 1 lb. soda and 10 lb.
Glauber's salt, then diazotise and develop with beta-naphthol.

_Black Brown._--Dye with 3 lb. Diamine cutch, 3 lb. Diamine black B H, 8
lb. soda and 20 lb. Glauber's salt, then diazotised and develop with
phenylene diamine.

_Blue Black._--Dye with 4-1/2 lb. Diamine black R O, 3 lb. soda and 20
lb. Glauber's salt, then diazotise and develop with beta-naphthol.

_Blue Black._--Dye with 4-1/2 lb. Diamine black R O, 3 lb. soda and 20
lb. Glauber's salt, then diazotise and develop with naphthylamine ether.

_Blue Black._--Dye with 5 lb. Diamine black B O, 3 lb. soda and 20 lb.
Glauber's salt, then diazotise and develop with beta-naphthol.

_Dark Blue._--Dye with 4 lb. Diamine black R O, 3 lb. soda and 20 lb.
Glauber's salt, then diazotise and develop with blue developer A N.

_Black._--Dye with 5 lb. Diamine black R O, 1 oz. Diamine bronze G, 3
lb. soda and 20 lb. Glauber's salt, then diazotise and develop with
phenylene diamine.

The Diamine blacks are a range of very useful dye-stuffs, and by their
means alone and in conjunction with the various developers as seen in
the examples given above a range of useful shades of blue, navy blue,
and blacks of every tone can be obtained. It may also be added that many
of the direct dyes, although not diazotisable, are not altered by the
process and so may be used along with diazotisable dyes for the purpose
of shading them, and in that way a great range of shades can be
produced, particularly by combining Primuline with other dyes.

(4) DIRECT DYEING FOLLOWED BY FIXATION WITH COUPLERS.

A further development in the application of the direct dyes has of late
years been made. This is a two-bath method. The cotton is dyed with
certain of the direct dyes: Primuline, Diamine jet blacks, Diazo blacks,
Toluylene orange and brown, Diazo brown, Diamine nitrazol dyes, Benzo
nitrol dyes, etc., in the usual way. Then a bath is prepared by
diazotising paranitroaniline, benzidine, metanitraniline, dianisidine,
etc., or by using the ready diazotised preparations which are now on the
market, Nitrazol C, Azophor red P N, Azophor blue P N, etc., and
immersing the dyed cotton in this bath. Combination takes place between
the dye on the fibre and the diazo compound in this bath, and a new
product is produced direct on the fibre, which being insoluble is very
resistant to washing and soaping. These "coupled" shades, as