Classic BioLauge is used for the preparatory lye treatment of wood prior to oiling with Classic BaseOil or prior to the classical soap treatment of coniferous woods with Classic BioSoap. It reacts with the natural, biological wood ingredients. With it, the woods absorb greatly Classic BaseOil, Classic BaseOil Color shows even more intense colors. Classic BioLauge darkens oak wood, after oiling an antique effect is achieved. Coniferous woods darken similar to the natural light.