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Kryptonite: Green Kryptonite
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Kryptonite is a radioactive Kryptonian mineral. When the planet Krypton exploded and the baby Kal-El was sent to Earth, his spaceship's descent was disguised with a spectacular and destructive meteor shower, which struck the town of Smallville, Kansas, in October 1989. The meteors were made up of the exploded planet's core. However, kryptonite was ... found in Asia long before Krypton's destruction, suggesting it might be a natural occurring radioactive element from Krypton. Since the meteor shower, the rocks are found in the soil of the town in abundance and are known to the residents as "[M]eteor rock" (though Clark termed the rocks "kryptonite" after learning of his heritage). Kryptonite is most commonly found in a dark green form but exists in a few other forms as well.
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Green Kryptonite is the most common form of Kryptonite. It exists primarily as a metallic ore, but can ... be found in crystalline forms. The most debillitating aspect of green Kryptonite does not stem so much from the unrefined ore itself, but rather from the waves of radiation that it generates. Exposure to green Kryptonite radiation will greatly weaken a Kryptonian, robbing them of their powers. Prolonged exposure to green Kryptonite proves fatal. Over time, a Kryptonian may develop a slight immunity to the effects of green Kryptonite, but ultimately, green K radiation will poison the body's cell structure resulting in death.
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Some issues of Superman have indicated the mechanism by which Green Kryptonite may hurt Superman. Like Hanna-Barbera's Birdman, Superman in some ways is a living solar battery; his cells absorb electromagnetic radiation from yellow stars (like Earth's sun). Kryptonite's radioactivity possibly interferes with this semi-photosynthetic process, driving the energy out of his cells in a painful fashion. Long term and high-level exposure to Green Kryptonite can be fatal to Superman. In post-Crisis comics, long-term exposure of kryptonite to human beings is known to have the same effect as exposure to Earth-born radioactive materials; these effects include cancer. Lex Luthor discovered this inadvertently after acquiring a ring with a Green Kryptonite fragment set in it to provide protection against Superman.
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Created from Green Kryptonite that passed through a mysterious red-hued cloud en route to Earth. Red Kryptonite inflicts one of a variety of odd effects on Kryptonians, typically creating an initial "tingling effect" in those affected. No two chunks of Red Kryptonite have the same effect. Red Kryptonite effects typically last for 24-48 hours (though sometimes as long as 72), after which the Kryptonian in question is always immune to that specific chunk of Red Kryptonite. Superman has suffered the following effects upon exposure to various pieces of Red Kryptonite: being turned into a dragon, a non-powered giant, a dwarf, an ant-headed humanoid, a lunatic, and an amnesiac; being made unable to see anything colored green; growing incredibly long hair, nails, and beard; being rendered totally powerless; growing fat; gaining the ability to read thoughts; growing a third eye in the back of his head; losing his invulnerability along the left side of his body; being split into an evil Superman and a good Clark Kent; being rendered unable to speak or write anything but Kryptonian, the language used on Krypton; growing an extra set of arms; becoming clumsy when trying to help out; swapping bodies with the person nearest him upon exposure to it; transferring his powers; rapidly aging; and multiple personality changes. In post-Crisis continuity, Red Kryptonite first appeared as an artificial construct of Mr. Mxyzptlk; a second variety was later revealed as a synthetic variant created by Ra's al Ghul, using notes he stole from Batman.
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Black Kryptonite was first introduced in the Smallville television series, in the fourth season premiere episode "Crusade"," as Kryptonite with the ability to split the personality of Kryptonians. It later appears in the fourth season episode "Onyx," where it is revealed to split physically the bodies of humans. In the series, Black Kryptonite can be created by super-heating Green Kryptonite. It later made its first appearance in a DC comic in September 2005's Supergirl #2, where it apparently possessed the ability to split a person or a person's personality into two separate entities. In Supergirl #3, Luthor used Black Kryptonite on Supergirl, which caused her to split into two separate people, one wearing Supergirl's traditional costume, and another wearing a black-and-white version. Her black-and-white costume is similar to the one that Superman was wearing when he returned from the dead.
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Red Kryptonite has ... been shown in Smallville. Its effect on Clark Kent is to rid him of all inhibitions, making him rebellious and potentially dangerous if exposed to it for too long; however, it seems to have no effect on regular humans. Also created for the series was "Black Kryptonite" (first appearing in the episode "Crusade"), which is capable of separating certain entities within individual organisms, e.g., splitting a person's good and evil sides. In the series, after Clark's "reprogramming" by Jor-El in "the caves," Martha Kent used Black Kryptonite to reveal the two psyches of Clark, the militant Kal-El (not to be confused with the rebellious "Kal" alias caused by Red Kryptonite), and normal Clark. In a later episode, Lex Luthor was experimenting with a process to heat up Green Kryptonite and irradiate seeds, in order to separate the "weak" genes from the "strong" genes in the seeds. The result was hardy but rotten-tasting fruit, implying a yin and yang balance within fruit, as well as within humans.
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