OC stands for oleoresin capsicum, the active ingredient in pepper spray. Oleoresin is an oily resin extracted from plants, and capsicum refers to the genus of hot pepper plants (the same family that includes chili peppers and jalapeños). In practical terms, OC spray is a concentrated, weaponized version of the compound that makes spicy food hot.
What Oleoresin Capsicum Actually Is
Oleoresin capsicum is extracted from peppers in the nightshade family, specifically the genus Capsicum. The extract contains a group of compounds called capsaicinoids, the same chemicals responsible for the burning sensation when you eat a hot pepper. To make it into a spray, manufacturers emulsify the oily extract in water and a carrier substance, or dissolve it in solvents, to create an aerosol that can be sprayed from a canister.
To put the potency in perspective: Sriracha hot sauce registers between 1,000 and 2,500 on the Scoville scale, the standard measure of spiciness. OC pepper sprays clock in above 2,000,000 on that same scale.
How OC Spray Affects the Body
When OC spray hits skin, eyes, or airways, capsaicinoids trigger intense neurogenic inflammation, essentially forcing pain and swelling responses across multiple systems at once. The effects hit almost immediately and target three areas simultaneously.
On the skin, you feel an intense burning sensation along with redness and heightened sensitivity to pain. In the eyes, the reaction is more dramatic: involuntary clamping of the eyelids, swelling around the eye sockets, and inflammation of the outer eye surface. For most people, temporary blindness lasts several minutes. Inhaling the spray causes a stinging or burning sensation in the nose and throat, chest tightness, and difficulty breathing. People with pre-existing respiratory conditions like asthma face higher risks from the lung inflammation OC triggers.
These effects generally last 20 to 30 minutes, though they can persist for several hours if contaminated clothing stays on.
OC Spray vs. Tear Gas
“Tear gas” is a slang term that usually refers to CS (2-chlorobenzalmalononitrile) in law enforcement, though it sometimes gets applied loosely to OC and other chemical irritants. The two are chemically distinct. CS is a synthetic compound, while OC is a natural plant extract. CS largely replaced an older tear gas chemical called CN (chloroacetophenone) because CS is less toxic but more potent.
Both OC and CS cause tearing, pain, and temporary incapacitation, and both tend to wear off within about 30 minutes without medical treatment. The key difference is that OC produces stronger inflammatory effects, particularly in the lungs, while CS acts more as a direct irritant to mucous membranes.
Removing OC Spray From Skin and Eyes
The single most effective step is moving to fresh air and away from the contaminated area. After that, remove any clothing that was exposed, since OC residue trapped in fabric extends the burning significantly. If you wear contact lenses, take them out, as they can trap the oily compound against your eyes.
Flush affected skin and eyes with large amounts of water or saline. This won’t neutralize the capsaicinoids instantly, but it helps wash away the oily residue and speeds symptom resolution. Specialized decontamination wipes designed for chemical irritants can also help on skin and around the eyes. One common home remedy, baby shampoo mixed with water, has been studied and shown to provide no better relief than plain water irrigation.
Legal Restrictions on Civilian Use
OC spray is legal for civilian self-defense in all 50 U.S. states, but many states place limits on canister size, concentration, or who can carry it. The restrictions vary widely. California caps canisters at 2.5 ounces, while Florida and Nevada allow up to 2 ounces. New Jersey and New York limit canisters to just 0.75 ounces, and Hawaii has the strictest cap at 0.5 ounces. New York goes further by also limiting the concentration to no more than 0.7% major capsaicinoids.
On the larger end, Arkansas allows canisters up to 10 ounces, and North Carolina permits up to about 5.3 ounces. Washington restricts minors to canisters no larger than 2 ounces. If you’re buying pepper spray for personal use, check your state’s specific rules on size and strength before purchasing.