Rev. Rul. 59-207

The use of anion exchange resin Duolite A-6 in a continuous column process for the treatment of white wines will be considered as being consistent with good commercial practice within the limitations of sections 240.524 and section 240.529 of the Federal Wine Regulations, provided the fixed acids are not reduced below five grams per liter and the restrictions imposed by Revenue Ruling 58-461, C.B. 1958-2, 999, in connection with the use of other approved anion exchange resins are observed. Winemakers, desiring to use anion exchange resin Duolite A-6 in a continuous column process for reducing the natural acidity of white wine, may receive the approval of the appropriate Assistant Regional Commissioner, Alcohol and Tobacco Tax, by the filing of appropriate notice pursuant to section 240.530 of the regulations.

Revenue Ruling 58-461, C.B. 1958-2, 999, containing a list of materials approved for the treatment or finishing of wine, as amplified by Revenue Ruling 58-595, C.B. 1958-2, 1003, Revenue Ruling 58-596, C.B. 1958-2, 1003, Revenue Ruling 59-105, below, Revenue Ruling 59-150, page 728, and Revenue Ruling 59-189, page 728, is hereby further amplified.