6. Exposure Lightsource.
emulsion needs to be exposed, much like film.
sensitive to the uv spectrum of light, its best to use a source of light that emits much uv.
i use an actinic/BL fluroescent (sp? ) tube, 4 feet long/32 watts.
its a T8 diameter bulb, and was purchased for my fishtank at a aquarium website.
you can also use fluorescent tubes ending in the letters BL - which indicate blacklight.
note that the bulbs arent the purplish black coared party blacklight bulbs.
other light sources such as halogen lights with the uv filter removed and the sun may also be used.
exposure times vary on how opaque your positive is, the distance of the lightsource, the nature of the lightsource, the emulsion used, and what kind of an image you are burning, its best to do a test strip and find the best time for your setup.