Experimental procedure
Procedure
Increasing the sugar content of a must
The volume of alcohol in a finished wine is directly related to how much fermentable sugar (by weight) the must contains. A triple-scale hydrometer (with Specific Gravity, potential Alcohol, and Brix/Balling scales) lets you read the predicted value directly.
Sweetening a Finished Dry Wine
If you sweeten a finished wine, always use sugar syrup; never use dry sudar. If you plan to sweeten and bottle a wine, you must use sorbate preservative to prevent renewed in-bottle fermentation (and possible explosions).