18 BULLETIN 952, U. S. DEPARTMENT OF AGRICULTURE. 
be about 484 tons, which would yield 484 tons of tannin extract. or 
96.800 pounds. Based on the analysis and behavior of the extract 
in tanning, a value of 3 cents a pound may be considered a con- 
servative figure. The gross returns of this extract. therefore, would 
be $2.904. 
QUANTITY, USES, AND VALUE OF THE OIL, OIL CAKE, AND 
TANNIN EXTRACT FROM GRAPE SEEDS. 
Grape-seed oil is semidrying in character and possesses qualities 
similar to those of soy-bean and cottonseed oils. In commerce it 
should find ready application as an edible oil, or as a soap, paint, 
or varnish oil. Based on these facts. it should have an equal value 
with these oils. The pressed oil should bring about 17 cents a pound 
(the price of soy-bean oil in December, 1919). Extracted oil usually 
rings 1 or 2 cents less a pound. 
The press cake from the decorticated seed contains 4.48 per cent 
‘fat. 14 per cent protein, 29.7 per cent nitrogen-free extract, and 43.2 
per cent crude fiber, and should find use as an excellent stock food, 
comparing favorably with such feeding stuffs as sunflower seeds, 
cottonseed. coconut cake, palm-nut cake, timothy hay, and alfalia 
hay. Based on the value of these common feeding stuffs, the value 
of the press cake can conservatively be figured at $30 a ton. 
The undecorticated meal from the solvent-extraction process con- 
tains a much higher centent of fiber and tannin and a much lower 
content of fat and could probably not be figured at more than $12 
a ton. If the seed were decorticated, as in the expeller operation, 
the meal should bring about $25 a ton. 
The quantities and gross value of the expeller oil, oil cake. and 
tannin extract. or the solvent oil and meal. capable of being manu- 
factured from the total annual output of grape seeds are presented 
in Table I. 
TABLE I—Q grec caieee and gross value o7 products capable of being manufactured 
om grape seeds by the expeller and solvent processes. 
Hulls ( 487 per cent Oi i seeds) a ae hee ae nb Te rd Oe ROE Sa 483 
> Ti « ." = = = q 
; us 2 Wig Hy i 
Fe ee ee a ee ee Pe ee ee a ere ae Ce 
