What color would Vegetable oil when in contact with Copper Sulfate and Sodium hydroxide?

When vegetable oil comes into contact with copper sulfate and sodium hydroxide, it generally remains a yellowish or light brown color. The reaction primarily involves the sodium hydroxide acting as a base and potentially saponifying the oil, but the vegetable oil itself does not change color significantly in this process. The copper sulfate may impart a blue hue to any aqueous layer, but the oil layer will retain its original color.