The hydroxyl radical, OH, is the neutral form of the hydroxide ion (OH–). Hydroxyl radicals are short-lived with an average half-life of less than two seconds and are diatomic molecules that are highly reactive.
Hydroxyls are naturally formed by the reaction of UV light from the sun disassembling water vapor (H20) to get a hydrogen atom and oxygen (O2) to get an oxygen atom which are combined together to form the hydroxyl radical (*OH).
All hydroxyl generators currently used in the restoration industry incorporate some form of UV light in their process.
The most preferred and safest technology, which was developed with the National Aeronautics and Space Administration (NASA) utilizes UVC light in the 254nm wavelength to excite nano sized particles of Titanium Dioxide to generate hydroxyl radicals. This process has been deemed safe by NASA, it has been used in the Space Station, and also certified by the Federal Drug Administration (FDA) as a Type 2 Medical Device that is approved for use in hospitals and to include neonatal and baby wards.