It is illegal to sell denatured spirits, or any article containing denatured spirits, for beverage purposes. Any person who sells denatured spirits, or any substance or preparation made with or containing denatured spirits, for use, or for sale for use, for beverage purposes, or who sells any such products under circumstances in which it might reasonably appear that it is the intention of the purchaser to procure the same for sale or use for beverage purposes, is subject to the registration and other requirements of this part.

(26 U.S.C. 5273)