GREEN MINERAL PIGMENTS.

*57

Chrome-Green.

thickened with i gallon of gum tragacanth water. The solution when strainedand well mixed is ready for printing. When printed, the cloth is passed onrollers through a solution of arsenite of soda at 6° Tw., each length of clothbeing about 15 seconds in the bath. The fabric is then rinsed in cold water,dried, and finished.

The arsenite of soda bath is prepared by dissolving two drams of whitearsenious acid in 1 gallon of caustic soda at 5° Tw. If a deeper yellow shadeshould be desired, more arsenic must be employed ; if a deeper shade ofbluer more soda. By varying these constituents several shades of green maybe obtained.

Aceto-arsenite of copper,—

3 (AsOMc 2 h 3 o 0 4 ,

Cu"u)

F '

(>■ •

Wilner, an Arsenical, Green.