In case a layer of varnish is used over a subject to protect it against the sun's ultraviolet radiation, this layer must be removed before taking a photograph. Due to the very low intensity of light in practice, it is very difficult to use a common exposure meter to take measurements. Correct exposure time can be found only with a series of test exposures, depending on the lighting equipment and the size of the subject. The lights must be placed as close to the subject as possible, while being able to illuminate the whole surface, i.e. from 20 to 50 cm. Using Kodak T-Max 400 ASA as 800 ASA is a good solution without needed pushing proccessing.
Image contrast decreases as the wavelength of radiation becomes shorter.
With color films, daylight type film is preferable. Using the new Kodak E100S or Fuji Provia you would not have big problems with reciprocity effects and color changes. You might need a second color correction filter for better overall color balance. This filter must be fitted between the barrier filter and the lens. Focusing for ultraviolet light is another problem.