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:banghead: Well that's what I get... Just kidding. I'm no physicist or anything, but as you pointed out, the contrast helps...I just wouldn't use black.

Neon green might be good, unless you live...

+1 To this, but I suggest using a BLUE or RED marker. Blue wavelength light travel's faster and is registered more easily by the human eye. Red's not bad either. Black is harder to see unless you...