The oil has given fair service in some paints when mixed with upwards of 75% of pure linseed oil. It is of a semi-drying nature, but may be made to dry rapidly when mixed with manganese and lead linoleate driers. By compounding it under heat with tung oil and rosin, a substitute for linseed oil is produced, which some claim to be quite valuable. Table I gives the constants of several samples of soya oil examined by the writer. Table II shows the iodine value of mixtures of soya and linseed oils. Table III shows the results of drying experiments on soya oils containing different percentages of lead and manganese driers. TABLE I CHEMICAL CHARACTERISTICS OF SOYA BEAN OIL =======+==========+===========+============+==========+=========== Sample | Specific | Acid No. | Saponifi- | Iodine |Per cent. No. | gravity | | cation | No. | of foots | | | No. | | -------+----------+-----------+------------+----------+----------- 1 | 0.9233 | 1.87 | 188.4 | 127.8 | 3.81 2 | 0.9240 | 1.92 | 188.3 | 127.2 | -- 3 | 0.9231 | 1.90 | 187.8 | 131.7 | -- 4 | 0.9233 | 1.91 | 188.4 | 129.8 | -- 5 | -- | -- | -- | 130.0 | -- 6 | -- | -- | -- | 132.6 | -- 7 | -- | -- | -- | 136.0 | -- Average| 0.9234 | 1.90 | 188.2 | 130.7 | -- =======+==========+===========+============+==========+=========== TABLE II IODINE VALUES OF LINSEED OIL AND MIXED OILS ==============+============+============+============+============ | | Soya | Soya | Soya Sample No. | Straight |25 per cent.|50 per cent.|75 per cent. | linseed | Linseed | Linseed | Linseed | |75 per cent.|50 per cent.|25 per cent. --------------+------------+------------+------------+------------ 1 | 190.3 | 175.2 | 160.7 | 140.4 2 | 189.5 | 175.9 | 161.7 | 140.8 3 | 188.0 | 175.4 | 160.3 | 139.0 --------------+------------+------------+------------+------------ Average | 189.3 | 175.5 | 160.9 | 140.4 ==============+============+============+============+============ TABLE III SOYA BEAN OIL AND LEAD DRIER