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Keawbankrud, W.; Rattanabun, W.; Reungkred, J.; Jusombut, S.; Seako, T.; Suthiporn, P.; Nantakarat, S.; Neamchuchuen, T. The application of copper sulfate mixed with Caesalpinia sappan L. extract to increase colorfastness in pressed blush products. Cre.Sci. 2024, 16, 256309.