Oechsle scale The mass difference between equivalent volumes of must and water is almost entirely due to the dissolved sugar in the must. Since the alcohol in wine is produced by fermentation of the sugar, the Oechsle scale is used to predict the maximal possible alcohol content of the finished wine. This measure is commonly used to select when to harvest grapes. In the vineyard, the must density is usually measured by using a refractometer by crushing a few grapes between the fingers and letting the must drip onto the glass prism of the refractometer. In countries using the Oechsle scale, the
Mexican wine by clergy. The Santo Tomás Mission, founded in Baja California by Jesuit priests in 1791, reactivated larger scale production of wine in Mexico. In 1843, Dominican priests began growing grapes at the nearby Nuestra Señora de Guadalupe del Norte mission, located in what is now called Valle de Guadalupe. This valley is one of the few in the world, along with others such as the Napa Valley and the Rhone Valley, in which premium wine grapes can be grown. In the 1850s, as part of Mexico’s Reform War, many of the Church’s land holdings were taken by the state. Most