Bored are we? This thread is more than 2 years old!
For green: Hyperlube
For Red: WaterWetter (actually pink)
For blue: above or Silkolene ProCCA (if you can get it locally!)
(now of course this is not intended as a comment on the performance of any of those!)
Otherwise, food coloring works fabulously well, even in the smallest of amounts (1 or 2 drops).
UV dye has its own thread.
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