Knife-Board (To Make A Common). Cover with thick buff leather, on which are put emery one part, crocus martis three parts, in very fine powder, mixed into a thick paste, with a little lard or sweet-oil, and spread on the leather to the thickness of a shilling. This gives a superior edge and polish to knives, and will not wear the knife near so much as the common method of using brick-dust on a board.