10/28/2026
This foaming reaction is what happens when hydrogen peroxide meets blood, and it’s also one of the best ways to get blood out of clothes.
Blood is loaded with an enzyme called catalase. A single catalase molecule can split millions of hydrogen peroxide molecules into water and oxygen every second. Proteins in the blood get trapped around those tiny oxygen bubbles, which is why you get foam instead of just fizz.
How to remove a blood stain:
1) Rinse with cool water. Never hot, because heat cooks the protein and sets the stain.
2) Treat with 3% hydrogen peroxide or an enzymatic stain remover containing protease or subtilisin, enzymes that break down protein.
3) Wash, then inspect before drying. The dryer will lock in whatever’s left.
Hydrogen peroxide is a mild bleach, so you may want to add a line about spot testing on colored or delicate fabrics first.
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