Aug 31, 2008 #1 D diamond brian Member Joined Mar 28, 2007 Messages 973 What is it, specifically, that causes sunlight to set urine stains :?: ?
Aug 31, 2008 #2 Mikey P Administrator Joined Oct 6, 2006 Messages 116,673 I was told by Bill Yeadon that it was the Lycopene in it that caused it to set.
