gwood, as they will dye with equal facility on
mordanted and unmordanted wool.

_Violet Black on Wool_.--Make the dye-bath with 4 lb. Acid Black B, or
Acid Black B B, 3 lb. sulphuric acid, and 10 lb. Glauber's salt. Work
at the boil for one hour. The B brand of these blacks gives shades
slightly redder in tone than the B B. The blacks are quite fast to
light and acids, but not to soaping.

_Blue Black on Wool_.--Dye as in the last recipe, but use Acid (p. 090)
Black S. This dye-stuff produces bluer shades of black than either B or
B B, and they are faster to soaping.

_Jet Black on Wool_.--Make the dye-bath with 4-1/2 lb. Acid Black S,
1/2 lb. Fast Yellow F Y, 3 lb. sulphuric acid, and 10 lb. Glauber's
salt. This shows how, by the addition of a little yellow dye-stuff,
the blue shade may be changed to a full jet black.

_Blue Black on Wool_.--The dye-bath is made with 4-1/2 lb. Naphthol
Black B (or 6 lb. Naphthol Black 3 B), 4 lb. sulphuric acid, and
10 lb. Glauber's salt. Work at the boil for one hour, then lift, wash
and dry. The Naphthol Blacks have long been used in wool dyeing, and
give excellent results, the 3 B brand dyeing much bluer shades than
the B brand. There is also a 4 R brand giving violet blacks. These
blacks are quite fast to acids and alkalies, are fast to light, and
resist washing very well, the B brand being the fastest. The following
recipe shows how a full jet shade can be obtained for these blacks:--

_Jet Black on Wool_.--Prepare the dye-bath with 4-1/2 lb, Naphthol
Black B, 1 lb. Naphthol Green B, 1/4 lb. Indian Yellow, 4 lb.
sulphuric acid, and 10 lb. Glauber's salt.

_Blue Black on Wool_.--Make the dye-bath with 5 lb. Anthracite Black
B, 10 lb. Glauber's salt, and 5 lb. bisulphate of soda, working at the
boil for one hour. Anthracite Black does not require a bath so acid as
do some other coal-tar blacks. The shade obtained is a full blue
black, which is fast to acids; alkalies turn it a little bluer, and
soaping causes some loss of colour.

_Violet Black on Wool_.--Make the dye-bath with 5 lb. Anthracite
Black R, and 10 lb. bisulphate of soda. The black thus obtained is a
good one, fairly fast to acids, alkalies and soaping.

_Dead Black on Wool_.--Make the dye-bath with 6 lb. Anthracite Black R,
1 lb. Anthracene Yellow C, and 10 lb. bisulphate of soda. Work at (p. 091)
the boil for one hour, then lift, add 3 lb. fluoride of chrome and work
again at the boil for twenty minutes.