How is the best way to photograph an object under a black light?

Question

trying to photograph a piece of petrified rock to show the mineral colors in the rock itself......any suggestions welcomed

Answer 1

To photograph a rock with the most accurate color rendition, illuminate it with full spectrum white light, and calibrate the color balance compensation of a digital camera to that light source, or use a well-balanced color film.

To photograph what the human eye sees when the rock is illuminated with ultraviolet or near-UV (black) light, use a standard camera the standard way.

To photograph what would be seen by an animal with vision sensitive to UV light, illuminate with UV, but use a camera or film sensitive to UV and add a filter which blocks all light except UV. Once you have the exposure or data, decide how to shift its spectrum to show something within the human-visible spectrum.

Answer 2

I assume with no flash...

Answer 3

it must be done only with an underwater camera! duh..