Norton Sharpening Stone Oil is specially formulated for all types of metal. It is a natural, highly refined light mineral oil. It is pharmacopoeia grade and therefore safe for use on kitchen tools. Mineral oil lubrication is recommended for all oil stones. Oil acts as an effective lubricant during the sharpening process to float away metal and abrasive dust that would otherwise clog up the stone and ultimately render it useless. Use this sharpening oil to help reduce particle build-up on the stone surface. This pharmacopoeia grade mineral oil meets FDA requirements for use near food and is designed specifically for sharpening stone use. It is the lubricant of choice for professional chefs and meat cutters. The oil is also suitable for use on wood cutting boards and utensils.