To make a flatting or filling for rough steel castings, mix together lib. of white lead and 1/4 lb. of terehine; thin down with turpentine till the mixture is of the consistency of paint. This Hatting will dry quickly and leave a smooth surface, on which the finishing colour may be applied. Black is generally used. To make a good black, mix 1/2 lb. of white Lead with loz. of driers or litharge; then add the black pigment, ground in oil, to the required shade, and thin down with turps till the whole is of the consistency of paint. Another mixture consists of 1 lb. of black paint 7 oz. if linseed oil, 2 oz. of turpentine, and 3/4 oz. of Litharge. Mix the litharge with the paint, then add the oil, and finally the turpentine.