Oil leak detection using smoke and mirrors

Where did I see smoke being used to determine the exact location of an oil leak? I want to make sure I repair the correct problem before I re-install a 318 motor with a rear main seal or oil pan gasket leaking. It would be cool to see a wift of smoke coming out of the sneaky little hole, wherever it is hiding. I can see me now yelling in triumph, "Eureka you dirty little b_______!"


I used the fluorescing dye and the black light flashlight to find my mystery leak. Turned out to be hidden by the front flaps of the Magnum one piece oil pan gasket and the LA style oil pan notches in that area