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INDELIBLE INK

Two drams lunar caustic, six ounces distilled or rainwater; dissolve, and add two drams gum-water. Wet the linen with the following preparation: Dissolve one-half an ounce prepared natron, four ounces water, add half ounce gum-water, (recipe below); after smoothing it with a 1 warm iron, write with the ink, using a gold, quill, or a new steel pen. The writing must be exposed to a hot sun for twelve hours; do not wash for one week, then be particular to get out the stain which the preparation will make. If this is followed in every particular, there need never be a failure. Gum-water for the above is composed of two drams gum-arabic to four ounces water. One tea-spoon makes two drams, two table-spoons make one ounce. If at any time the ink becomes too pale add a little of pure lunar caustic. Never write without using the preparation, as it will rot the cloth.