Brandy is made from early grapes in order to achieve higher acid concentration and lower sugar levels. Base wine generally contains smaller amount (up to 20 mg/l) of sulphur than regular wines, as it creates undesired copper(II) sulfate in reaction with copper in the pot stills. The yeast sediment produced during the fermentation may or may not be kept in the wine, depending on the brandy style. Brandy is distilled from the base wine in two phases. In the first, large part of water and solids is removed from the base, obtaining so-called "low wine", basically a concentrated wine with 28–30%
Sawdust brandy diluted to drinking strength) produced in this method has no additional risks compared to brandy produced from grain; it actually contains fewer fusel oils than traditional distilling methods involving spirits from grain or fruit. In spite of this, German law governing spirit production (overseen by the ") forbids the use of sawdust brandy in the production of alcoholic beverages. This ban stems from the purpose of the law as an agricultural subsidy, rather than out of public health concerns. Prior to modern, synthetic production methods, wood was also once commonly destructively distilled or dry distilled for the production of methanol