This video shows one method to help fix this problem. This was taken with just an Applie iPad’s camera. But the demonstration shows use of a magenta camera filter placed in front of the camera sensor. You can see the comparison between the image you get with this color compensating filter and without. No Photoshop, Lightroom or Premiere was used in creating this video. This is just as the camera saw it with no post production work whatsoever.
Can you use a mineral to test your UV flashlight? 365nm vs 395nm
How do you know whether your UV flashlight is really producing the wavelength it claims? You could use a spectrometer, of course, but...