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• Water-Proof Glues:-

I – The glue is put in water till it is soft, and subsequently melted in linseed oil at moderate heat. This glue is affected neither by water nor by vapors.

II – Dissolve a small quantity of sandarac and mastic In a little alcohol, and add a little turpentine. The solution is boiled in a kettle over the fire, and an equal quantity of a strong hot solution of glue and isinglass is added. Then filter through a cloth while hot.

III – Water-proof glue may also be produced by the simple addition of dichromate of potassium to the liquid glue solution, and subsequent exposure to the air.