if the color of a substance changes then a chemical change may have occurred
coloring is not change_of_color. color is not appearance. whitening is not change_of_color. coloring is change_of_color. color is appearance. change_of_color is change_of_state. change_of_color is not change_of_state. correction_fluid is color_other_than_white. whitening is change_of_color. value is color_property.