# 19.483 Specifications for marks.(a) *Basic requirements.* A proprietor must place the marks prescribed by this subpart on cases, encased containers, and packages of spirits and denatured spirits so that they are:(1) Of adequate size to be easily read;(2) Of a color in distinct contrast to the color of the background;(3) Legible; and(4) Durably affixed.(b) *Use of labels.* A proprietor may use labels as the means for applying prescribed marks if the labels meet the requirements of paragraph (a) of this section.(c) *Location.* A proprietor must place the prescribed marks on one side of the case or encased container, or on the head of the package.(26 U.S.C. 5206)