Section 72. Except as provided in sections seventy-eight and ninety-one, no person shall sell or offer or expose for sale articles of food which have been held in cold storage without notifying each person purchasing or intending to purchase the same that they have been so held by displaying in a conspicuous place a sign marked ''Cold Storage Goods Sold Here''. No person shall represent or advertise as fresh goods articles of food which have been held in cold storage.