I think I already have answer to my first question which is yes. I've been photographing fluorescent minerals (glow visible light under UV light source) lately and have been getting a blue wash over the specimens. It is most noticeable using long wave UV (368nm also called UV-A) and worse on flat surfaces facing the camera. I suspect that the camera sensor is picking up reflected UV light and interpreting it as blue. Would a UV haze filter on the lens cut the reflection? Below is an extreme example. To the naked eye there is no blue showing on this specimen other than a few dust specs. I'm using a Nikon D90 and a Panasonic LX5 with similar results.