(See also Inks)

The writing to be copied by means of the hectograph is done on good paper with an aniline ink. Formulas for suitable ones are appended. It is said that more copies can be obtained from writing with the purple ink than with other kinds:

Purple

I

Methyl violet........ 2 parts

Alcohol............. 2 parts

Sugar.............. 1 part

Glycerine........... 4 parts

Water.............. 24 parts

Dissolve the violet in the alcohol mixed with the glycerine; dissolve the sugar in the water; mix both solutions.

II

A good purple hectograph ink is made as follows: Dissolve 1 part methyl violet in 8 parts of water and add 1 part of glycerine. Gently warm the solution for an hour, and add, when cool, 1/4 part alcohol. Or take methyl violet, 1 part; water, 7 parts; and glycerine, 2 parts.

Black

Methyl violet........   10 parts

Nigrosin............   20 parts

Glycerine...........   30 parts

Gum arabic.........     5 parts

Alcohol.............   60 parts

Blue

Resorcin blue M.....   10 parts

Dilute acetic acid ....     1 part

Water..............   85 parts

Glycerine...........     4 parts

Alcohol.............   10 parts

Dissolve by heat.

Red

Fuchsin............   10 parts

Alcohol.............   10 parts

Glycerine...........   10 parts

Water..............   SO parts

Green

Aniline green, water

soluble........... 15 parts

Glycerine........... 10 parts

Water.............. 50 parts

Alcohol............. 10 parts

Repairing Hectographs

Instead of remelting the hectograph composition, which is not always successful, it is recommended to pour alcohol over the surface of the cleaned mass and to light it. After solidifying, the surface will be again ready for use.