Gelatine

Obtained from animal bones. Shipped in powder or sheet form in drums, bags or cans inside cases. Used in the food and photographic industries. Sheet and powdered gelatine should be stored at a moderate temperature, i.e. not near a boiler-room or engine-room and not exposed to the direct heat of the sun. When packed in bags, it may lose weight under dry conditions.
Exposure to moist air or contact with water will cause mould attack and lumpiness which would completely spoil edible and photographic gelatine for those purposes and leave a material of greatly reduced value as a source of glue. Powdered gelatine becomes hard and horny when wetted but can also be utilized for glue manufacture.
If prepared as a food product, it is readily contaminated when exposed.