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redleader · 04-30-2003, 03:05 PM

How about an IR detector and an IR sensitive dye? Not sure how easy it would be to get the dye right, but IR LEDs are pretty common.

04-30-2003, 03:05 PM	#26
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	How about an IR detector and an IR sensitive dye? Not sure how easy it would be to get the dye right, but IR LEDs are pretty common.