Quote Originally Posted by John Koehrer View Post
If you increased the shutter speed, wouldn't you have different colors where the shutter wasn't fully open when the flash went off?
Well obviously don't go faster than your X-sync speed if using a curtain shutter. OP has an SQ-A though which I believe has a leaf shutter so should sync at all speeds.

Given dim stage lighting and typical MF apertures (f/4 at largest), the spot is unlikely to even register on the film at 1/125 and you end up with a flash-only exposure, which of course renders the spot colour irrelevant. Just need to not use direct on-camera flash for
that morgue-photo look.