Stark's ink is one of a number of types of homemade inks whose recipes were widely available in the 19th century. People often made their own ink before commercially available ink was inexpensive and easily obtainable. The origin of the name is unknown.
This recipe is taken from the Household Cyclopedia of General Information, published in 1881. It is not in common use now, though the preparation of inks with similar methods was common at one time.
The addition of the sulfate of indigo renders the ink more permanent and less liable to mould. It is blue when first written with, but soon becomes an intense black.
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