What is oxygen bleach, and how is it different from chlorine bleach?

Oxygen bleach is a powder, usually sodium percarbonate (a salt of hydrogen peroxide and sodium carbonate) mixed with more sodium carbonate, the chemical in washing soda. OxiClean Versatile Stain Remover, for example, is 15 to 40 percent sodium percarbonate and 45 to 70 percent sodium carbonate, with a pH of 10.5. It lifts stains by oxidation like chlorine bleach, without chlorine, which is why people reach for it on colored fabrics. It is still a hazardous product: its maker classifies it as causing serious eye damage and harmful if swallowed or inhaled. A dissolved solution gives off oxygen gas, so it must never be stored in a sealed bottle. This page compares the two bleaches and covers hazards and storage.

Oxygen bleach and chlorine bleach side by side

The registration row matters. Under federal law, a claim to sanitize or disinfect makes a product a pesticide that must be registered [4]. A stain remover with no registration number makes no germ claim, and a homemade solution made from it cannot either. CDC's bleach dilution is written for chlorine bleach only [3].

What happens when oxygen bleach dissolves

Solvay, a producer, describes sodium percarbonate as "an addition salt of hydrogen peroxide and sodium carbonate" that is "readily soluble in water" [8]. Dissolved, it supplies both halves:

• the hydrogen peroxide does the bleaching, oxidizing colored compounds in stains;
• the sodium carbonate raises the pH and acts as a builder, softening hard water so the wash works better.

That is why the solution is alkaline (pH 10.5 on the SDS [1]) and why its handling rules look like those for washing soda plus those for peroxide. The washing soda page and the hydrogen peroxide page cover each half.

Water temperature

Like most reactions, the release of peroxide runs faster in warmer water. No source read for this page gives a temperature figure, so follow the directions on your product's label, and check the garment's care label for the warmest water it allows. The bleach in the wash page covers laundry temperatures and colorfastness.

Colors and fabrics

Oxygen bleach is the one people reach for on colors, but it is still an oxidizer, and not every dye or fiber tolerates it. Before soaking a colored item, test the solution on a hidden seam and let it dry. Follow the product's own list of fabrics to avoid; the garment's care label has the last word. Treating specific stains is on the stain removal page.

Why a mixed solution must not go in a sealed bottle

Even the dry powder breaks down slowly: Solvay says it "naturally decomposes very slowly to form sodium carbonate, water, oxygen and heat," and warns of "pressure buildup, which can result in a pressure burst if the material is confined in an unvented container" [8]. Once oxygen bleach is dissolved, the peroxide keeps decomposing into water and oxygen gas, and the oxygen has to go somewhere. In an open bucket it bubbles away. In a capped spray bottle or jar it builds pressure, which can bulge the container, force liquid out of the trigger or pop the cap when you open it, spraying an alkaline, eye-damaging liquid at you.

So:

1. Mix oxygen bleach solutions in an open container, for immediate use.
2. Mix only what you will use at once; for leftovers, follow the disposal page.
3. Never cap a dissolved solution to keep for later.
4. Store only the dry powder, in its original tub.

Liquid products that give off gas are often packed with vented closures; the venting page explains how they work, which matters if you make a peroxide product to sell.

What oxygen bleach must never be mixed with

• Chlorine bleach. The Clorox SDS lists oxidizing agents among the materials bleach is incompatible with [2], and CDC says never to mix bleach with any other cleaner [3].
• Acids, including vinegar. The OxiClean SDS lists strong acids as incompatible [1], and the sodium carbonate in it reacts with acid to give carbon dioxide, as the washing soda SDS states [5]. Adding vinegar also brings peroxide and acetic acid together, a combination North Carolina Extension warns against [6].
• Other cleaners in general, unless the label of one says the combination is intended.

OxiClean's hazard figures

Serious eye damage Category 1 is the same eye class chlorine bleach carries [2]. Pour powder gently, keep your face away from the scoop, and wear eye protection when you dissolve it in hot water. If powder or solution gets in an eye, rinse with water at once and keep rinsing for the 30 minutes the SDS gives [1], and call Poison Control at 1-800-222-1222 [7]. If a child swallows any, call the same number.

Storing oxygen bleach

The SDS: "Keep container closed when not in use. Store in a dry, cool place," and "Keep/Store away from direct sunlight, extremely high or low temperatures and incompatible materials" [1]. It also warns that a "Container may remain hazardous when empty" [1]. At home:

• Keep the lid tight. Moisture starts the same breakdown that happens in water.
• Keep the tub out of a damp laundry room floor or a hot garage.
• Keep it away from chlorine bleach and acid cleaners.
• Never decant the powder into a food container, and keep it out of children's reach. Household cleaning substances were the top substance category in poison center exposures for children 5 and under in 2024 [7].

Choosing a bleach for the job

For colored laundry and organic stains where you want no chlorine, use oxygen bleach, mixed fresh. For disinfecting a hard surface, use a registered product such as chlorine bleach used by its label or CDC's method, covered on the household bleach page. For how each one behaves in a washing machine, go to the bleach in the wash page.

References

1. Church & Dwight Co., Inc., Safety Data Sheet: OxiClean Versatile Stain Remover, version 4.0, revised August 15, 2022. https://images.thdstatic.com/catalog/pdfImages/fa/fa6c0181-1173-4973-9ead-e5fb14ef73a6.pdf
2. The Clorox Company, Safety Data Sheet: Clorox Regular Bleach2, revision 3, December 9, 2020. https://www.thecloroxcompany.com/wp-content/uploads/2020/12/US001153-Clorox-Regular-Bleach2_3.pdf
3. Centers for Disease Control and Prevention, Cleaning and Disinfecting with Bleach, last reviewed April 24, 2024. https://www.cdc.gov/hygiene/about/cleaning-and-disinfecting-with-bleach.html
4. U.S. Environmental Protection Agency, Determining If a Cleaning Product Is a Pesticide Under FIFRA, last updated July 6, 2026. https://www.epa.gov/pesticide-registration/determining-if-cleaning-product-pesticide-under-fifra
5. Church & Dwight Co., Inc., Safety Data Sheet: Arm & Hammer Super Washing Soda, version 1.0, October 2, 2015. https://uwaterloo.ca/fine-arts/sites/default/files/uploads/documents/arm_and_hammer_washing_soda_10-02-2015.pdf
6. N.C. Cooperative Extension, Yancey County Center, Maness, Health Risks of Mixing Household Cleaners, November 1, 2024. https://yancey.ces.ncsu.edu/2024/11/dontmix/
7. Poison Control (National Capital Poison Center), Poison Statistics: National Data 2024. https://www.poison.org/poison-statistics
8. Solvay, *Sodium Percarbonate: Safety & Handling*, technical data sheet PCS-SH, August 2019. https://www.solvay.com/sites/g/files/srpend221/files/2019-10/PCS%20Sodium%20Percarbonate%20Safety%20and%20Handling%20Information.pdf