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Hedons · 05-20-2008, 06:31 PM

test strips like that use chromatography. The line further up the strip is the control. It lights up when urine has reached it regardless of its content. If urine made it that far up the strip and it changes color (even just a little), then the urine absolutely positively made it past the actual test line zone.

-Hedons

05-20-2008, 06:31 PM	#5 (permalink)
Hedons Ribbed for her pleasure! Join Date: Dec 2000 Location: Chicago Burbs. Delta(x) times Delta(p) is greater than or equal to h-bar over two. Posts: 4,645 Thanks: 23 Thanked 189 Times in 101 Posts	test strips like that use chromatography. The line further up the strip is the control. It lights up when urine has reached it regardless of its content. If urine made it that far up the strip and it changes color (even just a little), then the urine absolutely positively made it past the actual test line zone. -Hedons __________________ New and improved! Now with flushable applicator.