(a) The basic permit requirements prescribed by the act of August 29, 1935 (27 U.S.C. 203), shall not be deemed applicable when the port director is satisfied that the liquor is for personal use or for experimental purposes in the making of analyses, tests, or comparisons.

(b) The production of a basic permit shall not be required when spirits are withdrawn from warehouse under any form of withdrawal entry.

(c) Blending or rectifying of wines or distilled spirits in class 6 manufacturing warehouses, or the bottling of imported distilled spirits in class 8 manipulation warehouses, shall not be permitted unless the proprietor has obtained an appropriate permit from the Bureau of Alcohol, Tobacco and Firearms.