INDELLIBLE INK.
Take of lunar caustic 100 grains, gum arabic 100 grains, make both fine and pour water enough over to dissolve it, put into a phial and stop tightly.
To make the preparation to be used before writing on the linen, take 2 drachms of salts of tartar; 2 drachms gum arabic, dissolve these in 1 ounce of rain water. Before using the ink, wet whatever article you wish to mark with this last preparation and dry with a smooth iron, then wash the gum out and you have the name indellibly fixed.