433 
Ratio between Absolute Alcohol and Proof Spirit. 
To express in terms of proof spirit a given percentage of 
absolute alcohol in volume, multiply that percentage by 1.7525, or 
1 of absolute aleohol = 1.75 = .57 absolute. Thus: 
100 vols. absolute aleohol = 175.25 proof spirit. 
1 vol. absolute aleohol = 1.7525 proof spirit. 
Ex.: A wine contains 13 per cent. absolute alcohol; 
find strength in proof spirit. 
175-25 
= 1-75 Proof sp. = 1 vol. absolute alcohol 
100 
175-25 
x 18° = 22-78 Proof spirit 
100 
Coversely : 
A wine contains 25 per cent. of proof spirit; bow much abso- 
lute alcohol? 
1:1:75::a2: 25 = 14-25 per cent. 
or: 
175 Proof spirit = 100 vols. absolute alcohol. 
100 Proof spirit = 100 + 100 
——————— = 57:02 absolute alcohol. 
175 
1 Proof spirit = 57 
100 
25 Proof spirit = 57 
— xX 25 = 14-25 absolute alcohol. 
100 
Formula for fortifying Wine. 
To find the number of liquid gallons of spirit required to zaise 
the given strength of a wine to any required strength :— 
Multiply the difference between the given alcoholic strength 
and the required strength by the number of gallons to be fortified. 
Divide the product by the difference between the required 
strength and the strength of spirit to be used. 
Ex.: Given spirit at 60° O.P., how much is required to raise 
the strength of 100 gallons of a wine at 24° O.T. to 
32° O.P.? 
(82 — 24) x 100 800 
——-—— = — = 6-25 Liquid gallons. 
160 — 32 128 
If required to raise to 35° O.P., 8.8 liquid gallons would be 
required. A wine containing 34 per cent. proof spirit is safe against 
lactic acid fermentation. 
