It has hitherto been impossible to get a satisfactory application for printing with rubber stamps on rough paper. Fatty vehicles are necessary for such paper, and they injure the India rubber. It is said, however, that if the rubber is first soaked in a solution of glue, and then in one of tannin, or bichromate of potash, it becomes impervious to the oils or fats. Gum arabic can be substituted for the glue.

Indelible Hand-Stamp Ink

I

Copper sulphate.... 20 parts Aniline chlorate .... 20 parts Rub up separately to a fine powder, then carefully mix, and add 10 parts of dextrin and incorporate. Add 5 parts of glycerine and rub up, adding water, a little at a time, until a homogeneous viscid mass is obtained. An aniline color is produced in the material, which boiling does not destroy.

II

Sodium carbonate . . 22 parts

Glycerine.......... 85 parts

Gum arabic, in powder............. 20 parts

Silver nitrate....... 11 parts

Ammonia water. ... 20 parts Venetian turpentine 10 parts Triturate the carbonate of sodium, gum arabic, and glycerine together. In a separate flask dissolve the silver nitrate in the ammonia water, mix the solution with the triturate, and heat to boiling, when the turpentine is to be added, with constant stirring. After stamping, expose to the sunlight or use a hot iron. The quantity of glycerine may be varied to suit circumstances.

White Stamping Ink for Embroidery

Zinc white.......... 2 drachms

Mucilage........... 1 drachm

Water.............. 6 drachms

Triturate the zinc white with a small quantity of water till quite smooth, then add the mucilage and the remainder of the water.