(a) The term “barrel proof” or “cask strength” may be used to refer to distilled spirits stored in wood barrels only when the bottling proof is not more than two degrees lower than the proof of the spirits when the spirits are dumped from the barrels.

(b) The term “original proof,” “original barrel proof,” “original cask strength,” or “entry proof” may be used only if the distilled spirits were stored in wooden barrels and the proof of the spirits entered into the barrel and the proof of the bottled spirits are the same.