Our All Natural Boot Oil blends pine pitch and mink oil into a solution that conditions Red Wing oil-tanned leathers including Harness, Oil Slick, Legacy, and Oro-iginal. This oil may initially darken leather. Our All Natural Boot Oil is an 8 oz. blend of pine pitch and mink oil that is specifically formulated to condition Red Wing oil-tanned leather. We recommend testing this product on a small, inconspicuous area of your footwear to determine how much it may darken leather before applying it to the entirety of your footwear. Leather maintenance is the most effective way to protect your investment and extend the life of footwear and other leather products.