Standard wine other than citrus wine, regardless of the fixed acid level, may be stabilized as a part of the finishing process by the addition of citric acid within the limitations of Sec. 24.246. Standard wine (including citrus wine) may be stabilized by the addition of fumaric acid within the limitations of Sec. 24.246. (Sec. 201, Pub. L. 85-859, 72 Stat. 1383, as amended (26 U.S.C. 5382))