1. When silicone is sterilized with UV it causes it to yellow over time but doesn’t change the properties or negatively effect it in any other way.
2.Depending on the wavelength, we distinguish UVA, UVB, UVC, and VUV (vacuum UV). Typically, the UV LEDs that we found on the small torch, are “black light”. They are at the limit of visibility and have a wavelength of 395 nm (sometimes 365 nm). Their use is rather reserved for the lighting of phosphorescent/fluorescent surfaces, or to highlight traces of blood, or sperm (as we see in police movies).
The UVs that interest us for disinfection are UVC, whose wavelength is between 200 and about 300 nm. The ideal value being 254 nm.
Indeed, at 254 nm the DNA of the cells is split and definitively prevents its replication. Even at low doses, there is evidence that bacteria exposed to this radiation are inactivated.
However, the small UV LEDs found in opto-electronics stores, or in small UV torches are only 395 nm and have no action. We must therefore do with “large” UV lamps, which are certainly effective for the outside of the doll, but can be less effective in reaching the internal parts.
There are UVC LEDs with a wavelength of 275 nm or even 265 nm. They are used in water sterilization applications, but I am not sure that they are easily found.
The ideal would be to be able to find these UVC LEDs in order to make yourself a battery assembly, which can be introduced into the private parts of the doll.
