The application of copper sulfate mixed with Caesalpinia sappan L. extract to increase colorfastness in pressed blush products

This study aims to increase the colorfastness of pressed blush products by combining copper sulfate with Caesalpinia sappan L. extract. This experiment consisted of four conditions used for color extraction: 70% w w-1, 95% w w-1, 70% w w-1 with 10% w w-1 copper sulfate, and 95% w w-1 with 10% w w-1 copper sulfate. The highest yield percentage of crude extract was found at 70% w w-1, with the highest absorption value (λmax) at 70% methanol with 10% w w-1 copper sulfate. The darkest shade of red was found at 70% w w-1 with 10% w w-1 copper sulfate. The development of pressed blush occurred when corn starch was mixed with more white color and smell than arrowroot flour. The highest red color was achieved at 4.5% w w-1, with the highest red - purple intensity. The microbial contamination test showed no microbial contamination in pressed blush products. GRAPHICAL ABSTRACT HIGHLIGHTS Caesalpinia sappan L. was extracted using maceration methods with methanol solvent. Phytochemical screening revealed pink anthraquinone and anthocyanidins. The chemical properties showed a pH range of 5.31–5.74, maximum light absorption, and mordant increased absorption. A compress blush was developed with corn starch and arrowroot flour, suitable for the cosmetic industry.