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Old 10-05-2009, 12:13 AM
Join Date: Feb 2001
Location: South Carolina
Posts: 24,534
I thought cat pee showed up under black light?

One of the furballs has been thinking outside the box (I know why and when it started, just haven't, you know, been able to quite stop it.) I got a UV flashlight to spot the spots, so I can Nature's Miracle them away and put a litter box on top of them, etc. I thought cat pee showed up like that? I found a shirt wet with known pee tonight, though, and it did not show up. (It's been more difficult to tell than I expected, because I forgot that, you know, white stuff was going to show up too.) Am I just dumb, or deluded?
Old 10-05-2009, 12:39 AM
Join Date: Aug 2003
Posts: 294
UV lights aside, maybe it's time for Heathcliff to become an "outdoor kitty" . . . . .at a very, very busy intersection, if ya know what I mean . . . . . .
Old 10-05-2009, 12:51 AM
Join Date: Dec 2003
Location: Seattle/Eastside, WA
Posts: 417
I've seen it work with a black light before. It was a device specifically marketed for that purpose, but as far as I could see it was just an ordinary black light. Worked very well.
Old 10-05-2009, 07:02 AM
Join Date: Oct 1999
Location: I'm right here!
Posts: 8,858
Maybe the pee needs to dry first?
Old 10-05-2009, 09:27 AM
Join Date: Feb 2001
Location: South Carolina
Posts: 24,534
Originally Posted by St. Anger View Post
UV lights aside, maybe it's time for Heathcliff to become an "outdoor kitty" . . . . .at a very, very busy intersection, if ya know what I mean . . . . . .
Cute. Just adorable.
Old 10-05-2009, 09:29 AM
Join Date: May 2001
Location: Scottsdale, more-or-less
Posts: 14,856
In my experience, cat urine needs to be dry to fluoresce, and it does so with a distinct yellow color.
Old 10-05-2009, 09:31 AM
Join Date: Mar 2002
Location: Southern Pennsylvania
Posts: 21,599
Here is a link about it, it seems to do a nice job explaining how to spot urine.
Old 10-05-2009, 06:28 PM
Charter Member
Join Date: Dec 1999
Location: Dogpatch/Middle TN.
Posts: 30,524
Turn the room light off, before trying the light.
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
~~~~Hunter S. Thompson
Old 10-06-2009, 08:40 AM
Charter Member
Join Date: Apr 1999
Location: Flavortown
Posts: 34,324
Originally Posted by Bosda Di'Chi of Tricor View Post
Turn the room light off, before trying the light.
Oh my god, it's like a Jackson Pollock painting!
Old 10-06-2009, 10:07 AM
Join Date: Jan 2001
Location: Austin, Texas
Posts: 1,924
Landlord and pet owner here.

Cat pee definitely shows up under a black light. So does dog pee, people pee, various foods and drinks... anything with phosphorus in it will glow under a black light. Pee puddles will be no more than about 3 or 4 inches in diameter on the carpet, but spread out when it gets to the padding. If you see a suspicious spot, you have to confirm it with your nose.

Don't even bother trying to address the problem on the carpet alone. You've got to get to the padding underneath, and sometimes the subfloor and tack bars (those strips of wood that hold the carpet down).
Old 10-06-2009, 10:23 AM
Join Date: Feb 2001
Location: South Carolina
Posts: 24,534
It isn't carpet, it's hardwood floors, rugs, and, god, laundry in laundry baskets and such.
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