Colophony rosin, cooked to form a pouring liquid consistency. It can be used as the base for different varnish preparations. Used alone it shows the defect of being friable upon drying – it is fragile, prone to cracking or splintering when used without other additions. In general, it can be made more plastic (flexible) by combining with a variety of vegetable oils – for example Cold Pressed Linseed Oil, Walnut Oil, Sun-thickened Linseed Oil or Stand Oil. Further refinement can be achieved by adding in oleo-resins such as Silver Fir Turpentine (so called Strasbourg Turpentine), Venice Turpentine (Larch Turpentine) and Canada Balsam. Rosin-Oil can be diluted with double rectified turpentine to gain thinner consistency as required.