Animal glues

The universal type is Hide prepared by boiling bones, hides, etc. in water, and obtainable in hard cake form which must be broken up in an old piece of sacking and soaked for 12 hours before heating; in pearl, grain and bead forms requiring only a short soaking time; and in liquid glues {Croid, Adams, etc.) in which the addition of formaldehyde keeps the glue sweet in storage, and acetic acid lowers the gel point. Casein glues prepared from milk curds are excellent all-purpose glues requiring the addition of cold water only, but stain woods rich in tannic acid although so-called non-staining types are available. Fish glues prepared from fish offal and skins (Seccotine, etc.) are extremely useful for small repair-work, but lack sufficient strength for structural work. Animal-blood glues are water resistant if hot pressed and are used in cheap foreign plywoods. All these glues set by chilling or absorption or evaporation of the water content.

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