Acids in wine ripened grapes. While concentration varies among grape varieties, it is usually found in higher levels with red wine grapes. The acid is created as a byproduct of the metabolization of nitrogen by yeast cells during fermentation. The combination of succinic acid with one molecule of ethanol will create the ester mono-ethyl succinate responsible for a mild, fruit aroma in wines. Acidity is highest in wine grapes just before the start of "veraison", which ushers in the ripening period of the annual cycle of grape vines. As the grapes ripen, their sugar levels increase and their acidity levels decrease. Through the
Ice wine an alcohol content as low as 6%. Ice wines produced in Canada usually have higher alcohol content, between 8 and 13 percent. In most years, ice wines from Canada generally have higher brix degree (must weight) compared to those from Germany. This is largely due to the more consistent winters in Canada. Must with insufficient brix level cannot be made into ice wine, and is thus often sold as "special select late harvest" or "select late harvest" at a fraction of the price that true ice wine commands. Ice wine Ice wine (or icewine; ) is a type of dessert