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Watch this movie for a brief introduction on quantum states. http://www.youtube.com/watch?v=kJBcXFsFa7Y

I've also googled around and found this picture explaining what is called uv curing. http://www.signindustry.com/flatbed_UV/articles/images/2008-...

So basically the uv light is kicking the electrons up multiple levels in the "photoinitiators", the "photoinitiators" stabilize by dropping levels and giving off photons. These photons excite the "Monomers" and "Oligomers" between which electrons can freely flow (radicals) making it possible to form new bonds, creating longer chains of atoms (a polymer) /amateurexplenation

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