My idea is years away but I wanted to compile at least some of the information that could be used to perfect my idea. In Ohio they have found a plastic that becomes magnetised at different levels depending on what color of light is shining on it. this would work perfectly with my idea because I can picture a crane holding a magnet that looks like the ones in junkyards. However it works for plastics. there could be lights on the magnet that could shine the blue light to pick up the plastics and green to drop them.
the picture is from http://www.hamilton.com.pl/
and the website that explains a bit of the research is http://researchnews.osu.edu/archive/magnetun.htm
I like to check my links and the hamilton site is incorrect. the photo can be found at http://i5.photobucket.com/albums/y173/HKYDakotaGuy/XL_magnet_junkyard.jpg
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