Formaldehyde -10%

Formaldehyde is a colorless, flammable gas with a strong, pungent odor used in medicine primarily for its disinfectant and preservative properties. It's a common antiseptic, sterilizer, and preservative in medical settings, especially in medical laboratories, and is also used in the creation of certain medical devices. Formaldehyde is also used in some vaccines to inactivate viruses and detoxify toxins.