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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow
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Home and Garden
Housekeeping
Stain Removal
How to Tell if a Stain Is Sperm Co-authored by Rani Gorgis and Janice Tieperman
Last Updated: February 18, 2026 Fact Checked
How can you detect sperm stains?
|
What color are sperm stains?
|
How to Treat Sperm Stains
|Show more|Show less X
This article was co-authored by Rani Gorgis and by wikiHow staff writer, Janice Tieperman. Rani Gorgis is a Laundry and Cleaning Specialist and the Owner of Park Blvd Laundry & Dry Cleaners in San Diego, California. With several years of experience in the laundry and cleaning industry, Rani specializes in dry cleaning, wash-n-fold, shirt laundry, and servicing smoke-damaged clothes. He holds a BS in Accounting and a CPA certification. There are 9 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 368,751 times.
Did you find a suspicious-looking stain on some clothing, bedsheets, or other fabric? You can figure out if the stain is semen using simple tests and tools. We’re here to walk you through exactly what to do and what to look for, along with ways to clean away those pesky stains once and for all.
How to Detect Sperm & What it Looks Like
Use a blacklight—if the stain is sperm, it will likely light up.
Check the color. Sperm stains are usually gray, light yellow, or off-white.
Feel the texture of the stain. If it's crusty, it could be sperm.
Remove dried stains with delicate detergent, upholstery-grade stain remover, or enzymatic pre-treatment cleaner.
Steps
Section 1 of 3:
How can you detect sperm stains?
1 Use a blacklight to detect sperm stains. Switch off the lights in the room and hold the blacklight over the material. Guide the light down the fabric and see what appears—in many cases, sperm lights up underneath the lamp. The stain itself may be yellow, blue, or some other color, depending on the exact light that you’re using.[1]XResearch source
A blacklight, also known as a Wood’s lamp or UV-A light, shines ultraviolet light over a given surface.[2]XResearch source
Keep in mind that a blacklight isn’t a 100% conclusive way of identifying sperm stains.[3]X Trustworthy Source PubMed CentralJournal archive from the U.S. National Institutes of Health Go to source Bodily fluids like urine and blood also look bright beneath a blacklight.[4]XResearch source
2 Transform your smartphone into a blacklight if you don't have one. Start by covering the LED camera light with a strip of transparent tape and coloring over the lens with a blue permanent marker. Layer another piece of tape on top and color it in with the blue marker again. Then, stick an extra section of tape over top and shade over the lens with a purple permanent marker. Your homemade blacklight is now ready to go![5]XResearch source
This DIY trick is much more useful than a blacklight phone app. While these apps simulate a blacklight, they don’t actually mimic the effects of one.
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3 Get more definitive proof with an at-home test. Use an at-home semen detection kit to test the stain that you spotted under the blacklight—it’ll test the fabric for acid phosphatase (AP), an enzyme found in semen and vaginal stains. Just keep in mind that this test isn’t completely conclusive, since AP is also found in various bodily fluids.[6]XResearch source
You can also use an at-home Prostate Specific Antigen (PSA) test to narrow down your results, but this isn’t totally conclusive, either.
If you’re really curious about the stain’s contents, send a fabric sample to a private laboratory for testing.
Advertisement Section 2 of 3:
What color are sperm stains?
Dried sperm stains look gray, light yellow, or off-white. These stains often look shiny and feel stiff to the touch, too.[7]X Trustworthy Source PubMed CentralJournal archive from the U.S. National Institutes of Health Go to source If the sperm is fresh, it might look pale gray, white, or off-white.[8]X Trustworthy Source Cleveland ClinicEducational website from one of the world's leading hospitals Go to source
Dried sperm stains might feel a little crusty, as well.[9]XResearch source
Section 3 of 3:
How to Treat Sperm Stains
1 Clean any fresh sperm stains from regular fabric with cold water. Grab your soiled garments or sheets and stick them under a stream of cold, running water. Steer clear of warm or hot water, though, as this can make the semen stain permanent. Here are some stain removal tips for other materials and surfaces:
Wool and silk: Soak the garment or sheet in a mixture of water and delicate detergent before sticking it in the washer or hand-washing it.
Carpet: Dab over the stain with a detergent-soaked sponge. Then, go over the surface with a clean sponge and blot the carpeting dry with paper towels.
Mattresses: Go over the semen stain with a moist sponge and an upholstery-grade stain remover. Then, blot away any leftover cleaner with a sponge. Dry off the spot-treated section of the mattress with several paper towels.
Upholstery: Dab at and soak up the stain with a wet cloth. If the sperm stain still doesn’t go away, spritz over the area with an upholstery cleaner. Then, dry off the surface with paper towels.[10]XResearch source
2 Treat dried stains with an enzymatic pre-treatment cleaner. Use a bristled brush to scrape away as much of the leftover stain as you can. Once the fabric is mostly clean, soak it in a mixture of water and an enzymatic pre-treatment cleaner. Then, stick the item in the washing machine afterward or wash it as you usually would.[11]XResearch source
Opt for a biological detergent when you’re washing the fabric.
If the item is made of silk or wool, soak it in a mixture of water and delicate detergent. Then, stick it in the washer or hand-wash it as usual.
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Co-authored by: Rani Gorgis Laundry & Cleaning Specialist This article was co-authored by Rani Gorgis and by wikiHow staff writer, Janice Tieperman. Rani Gorgis is a Laundry and Cleaning Specialist and the Owner of Park Blvd Laundry & Dry Cleaners in San Diego, California. With several years of experience in the laundry and cleaning industry, Rani specializes in dry cleaning, wash-n-fold, shirt laundry, and servicing smoke-damaged clothes. He holds a BS in Accounting and a CPA certification. This article has been viewed 368,751 times. 66 votes - 64% Co-authors: 3Updated: February 18, 2026 Views: 368,751 Categories: Stain Removal In other languages Portuguese French Spanish Indonesian Vietnamese Dutch Italian Czech Japanese
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Yes No Advertisement If you buy through links on our site, we may earn a commission.Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Rani Gorgis Laundry & Cleaning Specialist 66 votes - 64% Click a star to vote Co-authors: 3Updated: February 18, 2026 Views: 368,751
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Co-authored by: Rani Gorgis Laundry & Cleaning Specialist This article was co-authored by Rani Gorgis and by wikiHow staff writer, Janice Tieperman. Rani Gorgis is a Laundry and Cleaning Specialist and the Owner of Park Blvd Laundry & Dry Cleaners in San Diego, California. With several years of experience in the laundry and cleaning industry, Rani specializes in dry cleaning, wash-n-fold, shirt laundry, and servicing smoke-damaged clothes. He holds a BS in Accounting and a CPA certification. This article has been viewed 368,751 times. 66 votes - 64% Co-authors: 3 Updated: February 18, 2026 Views: 368,751 Categories: Stain Removal In other languages Portuguese French Spanish Indonesian Vietnamese Dutch Italian Czech Japanese 
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1 Use a blacklight to detect sperm stains. Switch off the lights in the room and hold the blacklight over the material. Guide the light down the fabric and see what appears—in many cases, sperm lights up underneath the lamp. The stain itself may be yellow, blue, or some other color, depending on the exact light that you’re using.[1] 
2 Transform your smartphone into a blacklight if you don't have one. Start by covering the LED camera light with a strip of transparent tape and coloring over the lens with a blue permanent marker. Layer another piece of tape on top and color it in with the blue marker again. Then, stick an extra section of tape over top and shade over the lens with a purple permanent marker. Your homemade blacklight is now ready to go![5] 
3 Get more definitive proof with an at-home test. Use an at-home semen detection kit to test the stain that you spotted under the blacklight—it’ll test the fabric for acid phosphatase (AP), an enzyme found in semen and vaginal stains. Just keep in mind that this test isn’t completely conclusive, since AP is also found in various bodily fluids.[6] 
Dried sperm stains look gray, light yellow, or off-white. These stains often look shiny and feel stiff to the touch, too.[7] If the sperm is fresh, it might look pale gray, white, or off-white.[8] 
1 Clean any fresh sperm stains from regular fabric with cold water. Grab your soiled garments or sheets and stick them under a stream of cold, running water. Steer clear of warm or hot water, though, as this can make the semen stain permanent. Here are some stain removal tips for other materials and surfaces: 
2 Treat dried stains with an enzymatic pre-treatment cleaner. Use a bristled brush to scrape away as much of the leftover stain as you can. Once the fabric is mostly clean, soak it in a mixture of water and an enzymatic pre-treatment cleaner. Then, stick the item in the washing machine afterward or wash it as you usually would.[11] 
Advertisement If you buy through links on our site, we may earn a commission.Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy.