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Another Durable Ink

For the marking liquid: rub together in a small mortar five scruples of lunar caustic with one drachm of gum arabic, one scruple of sap-green and one ounce of rain water.

For wetting the linen: mix together one ounce of salt of soda, two ounces of boiling water, and a table-spoonful of powdered gum arabic.

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Source

Directions for Cookery, in its Various Branches (1840).