http://www.youtube.com/watch?v=kK94lLZV1qg
salt water- depending on the amount of conductive liquid between the anode and cathode determines the amount of current flow.
http://cnmat.berkeley.edu/recipe/diy_position_sensing_linear_potentiometer_using_conductive_rubber
conductive rubber- the more tightly packed the the molecules are the more conductive the material becomes.
http://www.kobakant.at/DIY/?p=543
digikey lookup:
biver inc- amber 1.55v .5ma 3100 ohm
cree inc- blue 1.6v 2ma 800 ohm
dialight- clear 1.65v 2.5ma 660 ohm
jkl components- cyan 1.7v 3ma 567 ohm
king bright company- green 1.8v 4ma 450 ohm
led resistance
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