the possibility of using the oil-grease residue from black cotton oil, lacquer grade gasoline and a siccative as a binder mixture has been investigated with a view to enhancing the strength of baked cores and molds, shortening the baking period of the molding sand, replacing raw materials in short supply, and reducing atmospheric pollution. the oil-grease residue from black cotton oil was mixed with white spirit for 20-40 min without heating, and the calculated amount of siccative was added when the mixture became uniform. the residue in question is a mixture of saturated and unsaturated fatty acids in the range c//1//2-c//2//2 and polyphenolic gossipol derivatives (iodine number $greater than equivalent to$ 100, and acid number $less than equivalent to$ 90 mg koh per gram of residue). the siccatives used were both technical products, nf-1 or 64b. the binder preparation by the new technology utilizes more plentiful and less costly raw materials. the use of the new binder for molding and coremaking has led to higher strength after a (25) shorter baking period. the proposed binder contains less volatile materials and is less toxic