PLAN No. 375. AN INK THAT STANDS ALL TESTS
Reading edition
An eastern state recently adopted the following formula for its official black ink, after learning through the severest tests that it stands exposure to the sun for three months; exposure to all sorts of out door weather for six months; exposure to water, and soaking in water and alcohol.
A man who knew what the formula was, desiring to make a business of selling an ink so reliable, made it up in large quantities, and found it to be just as good as claimed.
This is the formula:
Tannic acid, 1⁄2 ounce; crystal gallic acid, 77 grains; sulphate of iron, 5 drams; gum arabic, 100 grains; dilute muriatic acid, 1⁄2 ounce; carbolic acid, 10 grains; clear rain water enough to make 11⁄4 pints. Mix the muriatic acid and water, and dissolve all the other ingredients in the mixture.
He sold large quantities of this ink to professional and business men, city, county and state officials, etc., and inside of a year was in receipt of a steady income.