. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN" 2, IT. S. DEPAKTMENT OP AGEICULTUEE. recommended especially for replacing linseed oil in the manufacture of patent leather and similar products and printing ink. The patent leather resulting is more flexible and less liable to crack, though it possesses a somewhat less glossy surface. An objection to its use in this manner, however, is a peculiar efflorescence which its presence causes to form on the surface of the preparation. Its moderate use in the manufacture of baked japans also has been found hi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN" 2, IT. S. DEPAKTMENT OP AGEICULTUEE. recommended especially for replacing linseed oil in the manufacture of patent leather and similar products and printing ink. The patent leather resulting is more flexible and less liable to crack, though it possesses a somewhat less glossy surface. An objection to its use in this manner, however, is a peculiar efflorescence which its presence causes to form on the surface of the preparation. Its moderate use in the manufacture of baked japans also has been found highly advantageous. Menhaden oil should, of course, be used with a drier, and for that purpose the best results are obtained by means of a tungate drier. A tungate drier is one in which tung oil, or China wood oil, is boiled with a lead and manganese oxide, and when the solution is complete this is then mixed with a properly- made resinate of lead and manganese. Such a drier becomes soluble in the oil at temperatures over 100° C, and hardens the resulting paint very thoroughly. For fabrics, however, fish oil must be heated to a temperature of over 200° C, and if air is injected at such a temperature the glycerides are expelled and thick oil is produced which, in conjunction with the drier just named, is equally good for printing inks. It is advisable, however, to add at least 25 per cent of either a heavy bodied linseed oil or a raw linseed oil which does not break before the manipulation just referred to is The manipulation requisite on the part of the manufacturers to render their oils immediately usable for paint vehicles involves merely the addition of the drier and boiled linseed oil to the fish oil. The product should be sold directly to the paint manufacturers. The advantages gained are a higher price gotten because of this manipulation and because of the elimination of the middleman, and the assurance which the paint manufacturer has that the oil pur- chased di
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