Black: First dip into pure water, then into a solution of nitrate of silver; let dry in the light.
Yellow: First immerse in a solution of nitrate of lead, then in a concentrated solution of chromate of potash.
Brown: Dip into a solution of permanganate of potash made strongly alkaline by the addition of soda.
Blue: Dip into a solution of indigo neutralized by the addition of soda.
Red: First dip into a diluted bath of nitric acid; then into an ammoniacal solution of carmine.
Green: Dip into a solution of verdigris.
Aniline colors may also be employed but they are less permanent.
Bleaching Celluloid.
Process Of Impregnating Fabrics With Celluloid.
CELLULOID CEMENTS AND GLUES: See Adhesives.