1. Aluminous mordant.
Take 50 gallons of boiling water.
100 lbs. of alum.
10 lbs. of soda crystals.
75 lbs. of acetate of lead.
The soda should be added slowly to the solution of the alum in the
water, and when the effervescence is finished, the pulverized acetate of
lead is put in and well stirred about till it be all dissolved and
decomposed. During the cooling, the mixture should be raked up a few
times, and then allowed to settle. The supernatant liquor is the
mordant; it has a density of 11° or 11-1/2° Baumé. It serves for reds
and pinks, and enters into the composition of puce and lilac.
2. Aluminous mordant.
Take 50 gallons of water.
100 lbs. of alum.
10 lbs. of soda crystals.
100 lbs. of acetate of lead;--operate as above directed.
The supernatant liquor here has a density of 12° Baumé; it is employed
for lapis resists or reserves, and the cylinder printing of madder reds.
3. Aluminous mordant.
Take 50 gallons of water.
100 lbs. of alum.
6 lbs. of soda crystals.
50 lbs. of acetate of lead;--operate as above directed.
This mordant is employed for uniform yellow grounds.