What is UV-induced visible fluorescence (UVIVF)?
UV-induced visible fluorescence is imaging that is achieved by inducing fluorescence with UV light but excluding the UV light from getting to the camera sensor.
How do you do UVIVF imaging?
Ideally this should be done:
1) in a dark room so there is no visible light getting to the subject
2) use a UV-IR cut filter (ideally Baader UV-IR cut) to block all UV light below 400nm from getting to the camera sensor (not all camera ICFs block all the UV light getting to the sensor)
3) mounted on tripod and using wired/wireless remote as this requires long exposures
4) UV torch used does not produce any light in 400nm+ wavelength (some 365nm UV torches do not fulfil this criteria)
When this is done properly, you will be rewarded with amazing images.