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Indestructible Writing Ink

Shellac, 4 parts; borax, 2 parts; soft water, 36 parts; boil in a close vessel till dissolved; then filter, and take of gum-arabic, 2 parts; soft water, 4 parts. Dissolve, and mix the two solutions together, and boil for 5 minutes as before, occasionally stirring to promote turns blue in a solution of iodine in weak their union; when cold, add a sufficient quan- spirit.