Wash. Rev. Code § 15.37.110
It shall be unlawful to sell, offer for sale, hold for sale, trade, barter, or to offer as an inducement for the sale of another product, milk, cream, or skim milk subject to the provisions of this chapter in containers which are not labeled in a conspicuous location readily visible to any person handling such containers with the following:
[ 1961 c 285 s 11.]