Same sting, different substance
Bear spray and personal pepper spray contain oleoresin capsicum, usually called OC: a concentrated oily extract of hot peppers, with capsaicin and related compounds doing the burning. It comes out of the can as a forceful fog or stream of droplets carried by a propellant. When it lands, it behaves like a sticky, colored oil.
Police tear gas in the United States is most often CS, a solid that is dispersed as fine particles. Some agencies also use OC or synthetic capsaicin (PAVA) in projectiles and sprays. After an incident, a home may hold one residue or both, so it is worth asking the agency what was deployed.
How the two residues behave
| Bear or pepper spray (OC) | Tear gas (CS) |
|---|---|
| Oily film, often orange or reddish where it landed heavily | Fine dry powder, sometimes a faint white film |
| Concentrated near the point of discharge rather than evenly spread | Spread widely by air movement, including into closed rooms |
| Smears when wiped dry; needs a degreasing detergent and repeated rinsing | Becomes airborne again when swept, shaken or blown |
| Soaks into fabric, foam and unsealed wood | Collects in carpet, bedding, upholstery and return ducts |
| Can transfer to hands and then to eyes hours later | Often accompanied by debris from the canister or entry |
What changes in the cleanup
| Cleanup question | OC spray residue | CS powder residue |
|---|---|---|
| First tool | Absorbent pads and degreasing detergent | HEPA vacuum and careful ventilation |
| Biggest mistake | Wiping with a dry cloth and spreading the oil | Sweeping or using a leaf blower or ordinary vacuum |
| Scope | Usually a zone around the discharge point | Often the whole house, plus closets and ducts |
| Fabric | Spot-heavy staining; launder separately with strong detergent | Light, wide contamination; many items need washing |
| Air system | Matters if spray reached a return or ran in a car with the fan on | Almost always part of the scope |
Clues that tell you which residue you have
- A spent spray can, safety clip or bear spray holster near the problem area points to OC.
- Orange or rust-colored droplets on walls, glass or a dashboard point to OC.
- Canister fragments, a burn mark or a hole in a window after police activity point to CS or a mixed deployment.
- Symptoms throughout a house, including rooms with closed doors, suggest airborne powder.
- Burning that appears mainly after touching a surface and then your face suggests oily residue.
General information for Berkeley, not a quote or professional advice. In an emergency, call 911.