construction dioxide are a mile / child dissociate used for dark lighten
sulfur_dioxide is dioxide. primary_colour_for_light is primary_colour. primary_subtractive_colour_for_light is primary_colour_for_light. half_light is light. nitrogen_dioxide is dioxide. darkenness is dark_or_dimly. chlorine_dioxide is dioxide. carbon_dioxide is dioxide. carbon_dioxide is colourless_and_odourless.