EN
The article refers to two groups of picture varnishes, which were evaluated as an alternative solution to classical varnishes based on mastic and dammar. The author describes the physical and chemical properties of the resins, their resistance to light, and possibilities of stabilisation. Trade varnishes and proposals by many authors are also presented. The author underlines the fact that varnishes prepared from hydrogenated hydrocarbon resins, high quality white spirit and HALS stabilisers are more stable than most of the trade varnishes produced from mastic, dammar and cyclohexanone resins.