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U. S. Government Standard Ink Recipe in Popular Science (January 1935, p. 54) 11.7 g tannic acid 3.8 g gallic acid 15 g iron sulfate 3 cc hydrochloric acid (aka muriatic acid; or 2 cc sulphuric acid) – used to prevent sediment forming 1 g carbolic acid-- a preservative to prevent mold* 3.5 g china-blue aniline dye (water-soluble) 1000 cc distilled water *Have corner drug store make up a solution containing 5 or 10 cc of water, the entire amount being substituted for the 1 gram called for in the formula 1. First dissolve the tannic and gallic acid crystals in about 400 cc water. 2. In anoth