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This question already has an answer here:

Kryptonite is green.... Can the Green Lantern defend himself against Kryptonians? Or can the ring not make something that acts sufficiently like kryptonite?

marked as duplicate by Thaddeus Howze, Valorum, The Fallen, DVK-on-Ahch-To, Null Feb 3 '15 at 2:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • @Thaddeus - I agree. Dupe. – Valorum Feb 3 '15 at 0:56
  • @Richard and others: Not disagreeing that the question is answered there, but searching "green lantern kryptonite" does not reveal that answer. And someone seeking the question I asked will not look for "Who can stop Superman?". So does this really count as a duplicate? Seems more like the answer should be given and a link presented for the realted question. – ThePopMachine Feb 3 '15 at 15:22
  • OK -- I read this: meta.stackexchange.com/questions/10841/… which is pretty clear that duplicate are not a bad thing and should persist unless they are literally identical. But this seems a little at odds with the banner text itself: "If those answers do not fully address your question, please edit this question to explain how it is different or ask a new question".... my key point being that while the answers to the duplicate cover the question, the duplicate question doesn't cover this question. – ThePopMachine Feb 3 '15 at 15:29
  • The mark of a dupe is if the answer to a similar question answers your question. If you're unsatisfied, you can take it to meta or chat, edit it in such a way to make it less dupey or post a bounty on the dupe question asking for more info. – Valorum Feb 3 '15 at 16:36
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Yes. This has actually happened on a number of occasions;

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The Green Lantern rings are capable of creating Kryptonite and Kryptonite Radiation because the rings are capable of Energy Projection and can therefore mimic certain types of materials and energy signatures.

http://dc.wikia.com/wiki/Green_Lantern_Ring

Energy Projection: The ring can be used to fire blasts of Oan energy or create weapons such as projectiles of them. The ring can project beams of force powered by the will of the user. The ring can be used to produce kryptonite and kryptonite radiation.

DC Comics Presents Vol 1 26

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