if something is one color during one time and another color during another time, then at something changes color
coloring is not change_of_color. red is colored_thing. change is when_one_thing_becomes_another_thing. shade is color. coloring is change_of_color. red_thing is colored_thing. change_of_color is not change_of_state. change_of_color is change_of_state. change is not when_one_thing_becomes_another_thing. things has colour