Characteristics of Color Fastness on the Yellow Natural Dyestuffs According to Accelerated Aging

Because cultural properties are a composite of various substances in addition to natural dyestuffs, an analysis based on the degradation of raw dyestuff materials should be performed first. This study selected Sophora japonica, Rheum undulatum, Gardenia jasminoides, and Phellodendron amurense among the commonly used yellow dyestuffs and performed an accelerated aging test on them. The results were then analyzed by evaluating color fastness according to the accelerated aging test of the dyestuffs. The color fastness of the dyestuffs selected above was excellent against ultraviolet (UV)accelerated aging. However, after dry- and wet-accelerated aging, the colors tended to darken, and yellow and red tinges faded. Wet-accelerated aging produced more color changes than dry-accelerated aging, indicating poor color fastness. Rheum undulatum is the dyestuff with the best color fastness, and Gardenia jasminoides is the dyestuff with the worst color fastness. As the accelerated aging method and aging time were increased, the Rheum undulatum dyestuff showed insignificant changes. Therefore, the color fastness of Rheum undulatum outperforms that of the other dyestuffs selected here. Gardenia jasminoides showed almost no color changes resulting from UV-accelerated aging. However, color changes occurred in dry- and wet-accelerated aging, with wet-accelerated aging having the worst color fastness. © 2022 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.