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Cheap Brown Marking Ink

A very cheap brown marking ink may be prepared from 4 parts acetate of manganese dis- 2523. Permanent Ink for Writing solved in 12 parts water. The place on the in Relief on Zinc. Bichloride of platinum, linen where the marks have to be made must dry, 1 part; gum-arabic, 1 part; distilled wabe previously moistened with the following ter, 10 parts. The letters traced upon zinc solution: 1 part yellow prussiate of potash, with this solution turn black immediately. part gum-arabic, 3 parts water. The linen, The black characters resist the action of weak having been saturated with the above solution, is dried, and afterwards marked with the manganese solution. On the letters becoming dry, the following solution is spread over the spot with a brush: 4 parts carbonate of potash, 10 parts water. The letters then become brown, and their color cannot be removed by alkalies, nor by acids, with the exception of dilute hydrochloric acid.