reen dye in
small proportions, which has been done in one of the recipes given
above.

By coupling, chroming or developing, the direct blacks can be made to
give full, deep and fast blacks, and examples of their use in this
manner will be found in following sections.

By using all the direct blacks in proportions varying from 1/4 to 1 per
cent. of dye-stuff to the weight of the cotton they give greys of
various tints and depths; a few examples of such greys will now be
given.

_Blue Grey._--Prepare the dye-bath with 1/2 lb. Oxydiamine black A, 1
lb. soda, 10 lb. Glauber's salt. Dye at the boil for one hour.

_Bright Grey._--Prepare a dye-bath with 4-1/2 oz. Azo mauve A M, 1-1/2
oz. Direct yellow G, 3 lb. soda, 15 lb. common salt.

_Silver Grey._--Prepare the dye-bath with 1/2 oz. Neutral grey G, 10 lb.
sulphate of soda. Work at the boil to shade, then lift, wash and dry.

_Slate._--Dye in a bath with 1/2 lb. Diamine black B H, 3 oz. Diamine
bronze G, 15 lb. Glauber's salt at the boil for three-quarters of an
hour.

_Bronze Grey._--Prepare a dye-bath with 1/2 lb. Diamine bronze G, 15 lb.
Glauber's salt, 3 lb. soap. Enter at about 160 deg. F., raise to boil and
work for one hour; lift, wash and dry.

_Dark Slate._--Prepare a dye-bath with 10 lb. Glauber's salt, 1-1/2 lb.
soap, 1 lb. Diamine black R O, 2 lb. Cotton brown N. Heat to about 150 deg.
F. Enter the goods, work for a short time, then raise to the boil and
work for one hour; lift, wash and dry.

_Green Grey._--Prepare a dye-bath with 10 lb. Glauber's salt, 1 lb.
Diamine black R O, 3/4 oz. Thioflavine S. Enter at from 150 deg. Tw. to 180 deg.
F., raise to boil and dye for one hour; wash and dry.

_Light Slate._--Prepare a dye-bath containing 2-1/4 lb. soap, 15 lb.
Glauber's salt, 6 oz. Diamine black R O, 1/2 oz. thioflavine S. Enter
cotton at 140 deg. F., work a little, then heat to boil and dye to shade;
lift, wash and dry.

_Grey._--Prepare the dye-bath with 1/2 lb. Diamine grey G, 1/2 oz.
Diamine scarlet B, 1 lb. soda, 1 lb. soap, 5 lb. Glauber's salt. Dye for
one hour at the boil.

_Light Grey._--Prepare the dye-bath with 1 lb. Diamine grey G, 1 lb.
soda, 1 lb. soap, 5 lb. Glauber's salt. Dye for one hour at the boil;
lift, rinse and dry.

It may be convenient here to deal with the question of the fastness of
the direct dyes to such influences as light, air, acids, alkalies,
washing and soaping, that have a very material influence on the use of