acid which then exerts its well-known
tendering action on the cotton.

The remedy for this evil lies partly with the dye manufacturer and
chiefly with the dyer. The dye manufacturer should see that his product
is made as free from sulphur as possible, while the dyer by careful
attention to thorough washing, thorough fixation in the chrome, etc.
baths, tends to eliminate all sulphur from the goods, and so prevent all
possibility of the cotton becoming affected.

_Blue._--Make the dye-bath with 22 lb. Immedial blue C, 13 lb. sulphide
of sodium, 50 lb. salt and 15 lb. caustic soda lye at 70 deg. Tw. Work at
just under the boil for one hour, keeping the goods well under the
surface of the liquor. After the dyeing the goods are well rinsed in the
water and then passed into a vat which contains 1 lb. peroxide of sodium
and 1 lb. sulphuric acid. This is started cold, after about fifteen
minutes heat slowly to about 150 deg., work for twenty minutes, then lift,
wash and dry. For subsequent lots of cotton there only need be used 7
lb. Immedial blue C. 2 lb. sulphide of sodium, 3 lb. salt and 1-1/2 lb.
caustic soda lye at 70 deg. Tw. The blue may also be developed by steaming
with air in a suitable chest or steaming chamber. By topping with 1/4
lb. New methylene blue N, very bright blue shades can be dyed.

_Dark Navy._--Prepare the dye-bath with 25 lb. Immedial blue C, 24 lb.
sulphide of sodium, 35 lb. common salt and 12 lb. caustic soda lye,
working at the boil for one hour, then rinse and develop in a bath made
from 2-1/2 lb. peroxide of sodium and 2-1/2 lb. sulphuric acid, started
cold, then after twenty minutes heated to 160 deg. F., twenty minutes longer
at that heat will be sufficient. For second and subsequent lots of
cotton there is added to the old bath 15 lb. Immedial blue C, 4 lb.
sulphide of sodium, 5 lb. salt and 2 lb. caustic soda lye of 70 deg. Tw.

_Blue._--A pale but not very bright shade of blue is dyed in a bath of 3
lb. Amidazol black 6 G, 5 lb. soda and 25 lb. salt. After working for
one hour at the boil, lift, rinse and pass into a bath which contains
2-1/2 lb. peroxide of sodium and 2-1/2 lb. sulphuric acid; this is
started cold, then heated to 150 deg. F., and kept at that heat for twenty
minutes, when the cotton is taken out, well washed and dried.

_Deep Blue._--Dye with 20 lb. Amidazol black 6 G, 5 lb. soda and 200 lb.
salt; develop with 2 lb. peroxide of sodium and 2-1/2 lb. sulphuric
acid, workin