An Experimental Study on Tolerance of the Tibetan Traditional Sculpture-painting Pigments
In the experimental process,realgar and malachite were selected as representatives of inorganic mineral pigments,while indigo and cochineal were chosen as representatives of plant pigments.The relationship between the color difference(△E)and the action time(t:day)of the pigment fading was used to explore the influencing factors of the color change of Tibetan sculpture-painting pigments.At the same time,according to the resistance of the pigment,the corrosion and light resistant pigment additive AX were added to the pigment to improve the resistance.The results show that the influence of corrosive substances such as acidity,alkalinity and oxidation on the pigments follows a rule of fast first and slow later,and the degree of influence on inorganic mineral pigments and plant pigments is different,with inorganic pigments being less affected.The influence of the three light sources on the two types of pigments is manifested as the color difference value becomes larger with the extension of the irradiation time.It displays that sunlight<red light<ultraviolet light,light has a greater impact on organic pigments.The AX in the experiment could improve the corrosion resistance and light resistance of the pigments,and improve the stability of the pigment color.