r
and 2-1/4 lb. hydrochloric acid, when well mixed there is added 2-1/2
lb. acetate of soda, when all is dissolved add sufficient water to make
6-1/2 gallons. This bath is used exactly in the same way as the
paranitroaniline developing bath, and it produces identical results in
every way.

_Paranitroaniline Brown._--By boiling the paranitroaniline red dyed
cotton in a weak bath of copper sulphate a very fine fast brown
resembling a cutch brown is produced. A better plan, however, is to
prepare the cotton with a ground containing an alkaline solution of
copper, 3 lb. beta-naphthol are dissolved in 5 pints of caustic soda lye
of 36 deg. Tw., to which is added 5 lb. Turkey-red oil and 10 pints alkaline
copper solution, water being added to make 13 gallons of liquor. The
cotton is treated in this way as with the ordinary beta-naphthol
preparation. The alkaline copper solution is made by taking 5 pints of
copper chloride solution at 76 deg. Tw., adding 3-1/4 lb. tartaric acid, 6
pints caustic soda lye, 70 deg. Tw., and 2 pints of glycerine. The
developing bath for the brown is the same as for the paranitroaniline
red, or the Azophor red P N bath may be used.

_Toluidine Orange._--For this colour the cotton is prepared with the
beta-naphthol in the ordinary way. The developing bath is made from 2
lb. orthonitrotoluidine mixed with 12 pints boiling water and 2-1/4
pints hydrochloric acid; when dissolved allow to cool and then add
12-1/2 lb. ice. When thoroughly cold stir in 2-1/2 pints of sodium
nitrite solution containing 3 lb. per gallon. Stir well for twenty
minutes, then filter; add 4 lb. sodium acetate and sufficient ice-cold
water to make 13 gallons. Use this bath in the same way as the
paranitroaniline bath.

_Beta-naphthylamine Red._--This red is a good one, but is not so bright
or so fast as the paranitroaniline red, hence although somewhat older in
point of time it is not dyed to the same extent. The developing bath is
made from 1-3/4 lb. beta-naphthylamine dissolved with the aid of 10
pints boiling water and 1 pint hydrochloric acid. When dissolved allow
to cool; add 27 lb. ice and 2 pints hydrochloric acid. When cooled to
32 deg. to 36 deg. Tw., add 3 pints sodium nitrite solution (3 lb. per gallon)
and 4 lb. sodium acetate, making up to 13 gallons with water. This also
is used in precisely the same way as the paranitroaniline red developing
liquor.

_Alpha-Naphthylamine Claret._--This is a very fine and fairl