Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Does Cat Pee Glow Under a Black Light? Science-Based Facts & Tips

Black light illuminating cat urine markings on a wall

Cats can easily be trained to use a litter box because they are generally clean animals and prefer keeping their bathroom contained and separate from their living spaces. However, sometimes, cats can have accidents in the house. It could be that their litter box is too dirty for their taste, they have health problems, or they simply made a mistake.

Whatever the reason, the scent of a cat’s urine can really stink up the place, especially if you can’t find the stain to properly clean it up and neutralize the odor. So, if you’re smelling cat urine in your home, you are probably wondering how to find the stain so you can get rid of the smell once and for all. We have the solution for you: a black light!

Here’s what you should know about how black lights can find and make cat urine glow and how to use one to find urine in your home.

divider cat faces 2 oct 2024

Cleaning Old Cat Urine Stains

Once you identify and mark the cat urine stains, you can get rid of lingering odors and stains by utilizing a bio-enzymatic cleaner. It contains good bacteria that work to “digest” and neutralize odors and stains. It doesn’t just cover up the smell; it will get rid of the phosphorus and proteins so absolutely no odor or stain is left behind when all is said and done.

Follow the directions on the product that you decide to invest in to get the best results.

Did you know there's an enzyme cleaner that does it all? The Hepper Advanced Bio-Enzyme Pet Stain & Odor Eliminator Spray permanently removes the very worst smells and stains (truly, everything you can imagine!), and they offer a 100% satisfaction guarantee! Click here to get yourself a bottle.

Hepper Advanced Bio-Enzyme Pet Stain & Odor Eliminator Spray
  • ADVANCED ENZYMATIC CLEANER - Penetrates the most stubborn smells and stains at the deepest molecular...
  • FOR ANY MESS, ON ANY SURFACE - This pet odor eliminator cleans your carpets, floors, furniture,...
  • FRESH, NATURAL ODOR - Our unique formulation doesn't rely on dangerous or unpleasant chemical...

At Catster, we’ve admired Hepper for many years, and decided to take a controlling ownership interest so that we could benefit from the outstanding products of this cool cat company!

divider cat faces 2 oct 2024

How Does a Black Light Find and Highlight Urine Stains?

The wavelengths that black lights emit interact with the phosphorus and proteins in urine, making them glow under the light. Any cat urine stains in your home that have not been cleaned with a bio-enzyme cleaner likely harbor phosphorus and/or protein even long after they have dried up. Therefore, black lights can usually pick up old cat urine stains when you’re hunting for them.

The longer the wavelengths that a black light emits, the more powerful and effective it will be when looking for urine stains.

Black light UV LED Flashlight
Black light UV LED Flashlight (Image Credit: DanceWithNyanko, via Wikimedia Commons CC BY-SA 4.0)

How to Use a Black Light to Find Cat Urine Stains

Utilizing a black light to find cat urine stains in your home is as simple as ensuring that the room is dark, then holding out the light and slowly moving it around. The room that you’re working in needs to be dark enough to see the black light illuminating. If it’s too bright in the room and you can’t clearly see the black light stream, you likely won’t find any urine stains even if they’re right in front of your face.

When a cat urine stain is present, it will glow bright yellow (sometimes with a greenish tint) under the black light.

divider cat paws 2 oct 2024

Top 3 Tips for Finding Cat Urine Stains

While the process of finding cat urine stains with a black light in your home is easy in general, there are a few things that you can do to make it even simpler and more satisfying overall.

Tip #1: Know That the Darker the Room Is, the Better

The darker the room that you’re working in, the easier it will be for you to see urine stains with your black light. Therefore, it’s a good idea to close the curtains and turn off all the lights (aside from the black light) while you work. If necessary, you can turn on a nightlight for safety reasons.

UV-light-illuminate-pet-urine-stain
Image Credit: Steve Heap, Shutterstock

Tip #2: Pay Close Attention to the Nooks and Crannies

Cats can spray the corners of rooms and right at the edges of furniture. If you’re just checking the floor, you could be missing a few stains. Take the time to inspect the corners, around the furniture, and even under the rugs while you’re working with your black light.

Tip #3: Mark the Stains That You Find

When you find a urine stain with your black light, mark the place with tape or string so you can go back to the stain and clean it after you turn the lights back on. This will help ensure that you know exactly where you need to clean. Consider surrounding the stain with the marking material so you don’t clean too little or too much surface area.

grey-british-shorthar-cat-pee-urine-carpet
Image Credit: Pixel-Shot, Shutterstock

divider cats oct 2024

Final Comments

Cat urine stains can be a pain, but they don’t have to be everlasting with the help of a black light and a bio-enzymatic cleaner. If your cat tends to have accidents, even if just occasionally, in your home, it’s a good idea to check for stains once a month or so.


Featured Image Credit: In The Light Photography, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Why Does My Cat Wake Me Up Every Morning? 5 Vet-Reviewed Reasons

Some cats wake up their human companions in the wee hours of the night for whatever reason. There are also those that somehow...

Does Vinegar Stop Cats From Pooping Where They Shouldn’t? Vet-Verified Tips & Reasons for This Behavior

Having to deal with a cat that has a bad habit of pooping somewhere they shouldn’t can be frustrating. Fortunately, vinegar could help....

Do Cats Get Jealous of Dogs? Feline Emotions Explained (Vet-Reviewed)

Jealousy is a complex emotion that humans experience when they have feelings of insecurity or fear. While we don’t typically think of our...

How Much Are Kitten Shots at PetSmart? Typical Cost & FAQ

Cats require vaccinations throughout their lives, but the most important ones are given when they’re kittens. This is a critical time in which...

More related

Do Feral Cats Know How to Purr? Vet-Approved Facts & FAQ

Hearing your cat purr is usually a sign you’re doing something right. Whether they have a full belly and are thanking you, or...

Robot Cats: Are They the Pets of the Future? Pros, Cons & FAQ

Plenty of people love cats but can’t have one due to allergies or other reasons. So, they go with a different pet or...

How to Get Cat Smell Out of the House: 10 Effective & Easy Ways

Even if you can’t see cats wandering around, you can recognize a cat house by the smell. Whether it’s everyday dander or random...

300+ Anime Cat Names: Ideas for Cool & Animated Cats

Originating from Japan, anime is just the Japanese word for animation. However, no one seems to do it quite as they do. Anime...

Keep reading

Why Is My Cat Attacking The Mailman? Possible Reasons & Prevention Tips

There are several reasons that your cat may decide to attack the mailman. In many cases, cats attack them for the same reasons that dogs do: out of territorial instincts or playful curiosity. In this article, we go over all...

Mailman delivering mail

Giardia in Cats: Causes, Signs & Care (Vet-Approved Facts & FAQ)

One of the most distressing experiences as a cat parent is suspecting or learning that your cat is unwell in some way. To add to your woes, medical terminology can sometimes be hard to process, especially when you’re under duress....

Sick cat, IV, dehydration, dropper

Why Does My Cat Lick the Wall? 5 Vet-Reviewed Reasons for This Behavior

Typically, cats use their tongues to clean themselves and lap up water. However, you may have noticed that your feline has taken a liking to licking the wall. From our perspective, there is no point in licking the wall at...

cat head_Goran Horvat_Pixabay

Can Cats Eat Chocolate Ice Cream? Vet-Reviewed Risks & Safe Alternatives

Cats are known for their curiosity, leading many of them to want to taste all kinds of human delicacies. As responsible cat parents, we need to be cautious when allowing our felines to consume specific foods; otherwise, our good intentions...

Can Cats Eat Chocolate Ice Cream

How Do Cats Really Feel When You Work From Home? Cat Feelings Explained (Vet-Reviewed)

The COVID-19 pandemic made working from home more common. Many people have had to learn to make adjustments to new work habits and lifestyles. Consequently, pets have also had to get used to spending more time with their parents. Cats...

woman working on her laptop with her cat on the couch

Why Is My Cat’s Stomach Gurgling? 8 Vet-Reviewed Reasons

If your cat’s stomach is making odd noises, you may be wondering what’s going on and what causes it. Cat stomach gurgles are often totally normal — they’re often just the sounds caused by everyday feline digestive processes, but these...

A man hand strokes a cat on a sore stomach

Does a Sphynx Need Sunscreen? 8 Summer Safety Tips (Vet-Reviewed)

Sphynx cats are loveable for far more reasons than their unusual appearance, but their lack of hair does provide major appeal for many people. These felines have lots of specialized needs, though, with special care for their skin being at...

sphynx cat sitting in autumn leaves

Why Does My Cat Wiggle Before They Pounce? 4 Common Reasons

The little wiggle that cats display before pouncing might be one of the most adorable things that you’ll observe as a cat parent. Whether your pet is stalking a live critter or a catnip-infused plush toy, before your cat gets...

a polydactyl cat ready to pounce