This is the lefranc and bourgeois duroziez harlem siccative medium. It is used to accentuate tone due to its natural coloring. It brightens the hue of colors that are lighter in color. It enhances the gloss and transparency of oil colors. It accelerates the setting time of color. It should be used with the utmost care. Too much could be counterproductive to your work. It is made by combining linseed oil, modified phenolic resin and quick drying medium.