Thanks Ron, I use a paintbrush also, but the crystal seems to attract tiny bits of stuff from the air. Funny thing: I used canned air to try to blow lint off, but I had the can almost upside down resulting in a fine frost coating everything - looked really pretty, but it melted quickly and the crystal was coated with water droplets.
After I posted my question, I thought perhaps post processing of the photo would work. I'll have to try it.
Bill