Fig. 7From: Improving the lightfastness and thermal stability of black urushi (oriental lacquer) by kraft lignin oleateTypical S–S curves of UR film. a UR, b UR-KL-1, c UR-KL-5, d UR-KL-10, e UR-OL-1, f UR-OL-5, g UR-OL-10Back to article page