A time exopsure of about 15 seconds coil run time.  The individual streamers are washed out, but the photo indicates the 3 or four major areas on the toroid where arcs initiate  The coil was running 5 gaps @ .030", .0185 uF poly cap in parallel with .007 uF salt water cap.

100 ASA Kodak Gold, expose in total darkness, 2 second coil run time, indirect incandescent light (150W) for 1 second,  black background.