(1) Every brewer shall cause to be legibly painted with oil colour, and keep so painted, on some conspicuous part of every mash tun, underback, wort receiver, copper heating tank, cooler and collecting and fermenting vessel intended to be used by him or her in his or her business, and on the outside of the door of every room and place wherein any part of his or her business is to be carried on, the name or initial letter or letters of the name of the vessel, room, or place, according to the purpose for which it is intended.