The constant sound you hear in many museums is "No Flash!". A solution to this would be to issue the staff with red post it notes to stick over the flash of cameras.
Many museums allow photography, but not flash photography, due to the risk of damage to light sensitive items and the distraction to other visitors. But many people have difficulty turning off the flash on their digital cameras.
My suggested solution is to issue the museum staff with red "Post It" note paper. When the staff see someone use a flash, they could stick one of these over the flash unit. The red coloring would block out most of the light of the flash and particularly the harmful UV light. When the person left the museum, they could remove the tag, with no harm to their camera.
If this became popular, Post It notes with "No Flash!" printed on the could be specially made for museums.