Every container of imitation ice cream or imitation ice milk shall be conspicuously so labeled, and every place where imitation ice cream or imitation ice milk is sold, shall display a conspicuous, legible sign which contains the words “imitation ice cream sold here” or “imitation ice milk sold here”, as the case may be, in plain, block letters that are not less than six inches high. The sign display requirements of this section shall not apply to any place, except any vending machine whether mobile or otherwise, where imitation ice cream or imitation ice milk is sold in properly labeled consumer packages or containers for off-premises consumption.