something that is used for soda has a uncertain crust on negative
carbon_dioxide is odorless_thing. soda is not carbonated. soda is carbonated. can_of_soda has lot_of_carbonation carbonate is not salt. sodium_carbonate is not salt. carbon_dioxide is not colourless_and_odourless. double_negative is negative. carbon_dioxide is colourless_and_odourless.