Packages of explosives shall be laid flat with top side up. Black powder, when stored in magazines with other explosives, shall be stored in separate piles. Corresponding grades and brands shall be stored together in such a manner so that brands and grade marks are visible. All stocks shall be stored so as to be easily counted and checked. Packages of explosives shall be piled in a stable manner. When any kind of explosive is removed from a magazine for use, the oldest explosive of that particular kind shall always be taken first. The use of storage pallets is mandatory.