To make composition rollers for branding sacks, soak until soft in sufficient water to cover it l1b. of nine-, then melt down by a gentle heat and stir in 4 lb. of treacle. The rollers are cast in cylindrical tinplate moulds with a cylindrical core of wood placed in the centre. In hot weather the material should be made stiffer by increasing the quantity of glue to 1 1/2 lb. The material will better withstand the heat if the rollers are dipped for a short time in a solution of bichromate of potash and then exposed to light: an insoluble film is by this means produced on the surface.