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Purple Marking Ink
A purple marking ink can be prepared by mixing 1 part bichloride of platinum with 16 parts distilled water. The place where the letters have to be written must be moistened with a solution of 3 parts carbonate of soda, 3 parts gum-arabic, and 12 parts water. The spot is then dried and made smooth. After the letters have ing mixture for the same purpose. been written with the platinum ink and become dry, the linen is moistened with a solution of 1 part chloride of tin in 4 parts distilled water, when an intense and beautiful purplered color makes its appearance.