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Black Steel Pen Ink

A black ink, not corroding steel pens, and neutral, may be prepared by digesting in an open vessel, 42 ounces coarsely-powdered nut-galls, 15 ounces gum senegal, 18 ounces sulphate of iron (free 10 days, or even longer, with frequent agita- from copper), 3 drachms aqua ammonia, 24 tion; then add 14 ounces gum-arabic (dis- ounces alcohol, and 18 quarts distilled or rain solved in a wine-glassful of water); lump water. Continue the digestion until the fluid sugar ounce; mix well, and afterwards has assumed a deep black color. further add 1½ ounces sulphate of iron (green