| try putting a bit of paper behind it, its a long shot but it might be because the light is too bright for the negative it is producing the red image, maybe some kind of background might help
like i said its a long shot but maybe worth a try?
im thinking here like red eye on a photo, the light reflects off the retena, possibly could be the same kind of thing, the colour on the negative is not strong enough compared to the film it is on?
i dont know, just an idea.... |