 In "Action Comics" #300 (1963), all of his powers including strength are activated by yellow sunlight and can be deactivated by red sunlight similar to that of Krypton's sun.Exposure to green kryptonite radiation nullifies Superman's powers and incapacitates him with pain and nausea; prolonged exposure will eventually kill him.Although green kryptonite is the most commonly seen form, writers have introduced other forms over the years