I was watching a film today, and was taking note as it pertained to some interesting filter work being done in front of the camera. At that second, I had remembered that using different colored filters in front of the lens sequentially can cause a color effect. Ergo, it occurred to me that this can happen inadvertently when color filters are being used for other purposes. Color filters serve a variety of purposes in black and white photography-- anyone who had done amateur b/w photography knows the advantages of having a color filter set at their disposal.
But I had remembered another use of such color-sequential photography being used in black and white. I popped in my DVD of the 1932 DR. JEKYLL AND MR. HYDE remembering they do the old gag with switching a red filter to a green filter (or vice versa) across the lens to get a color effect on someone's face with the complementary colors painted on. So I watch carefully, note what it looks like what filters they're sliding across the camera, take some screen shots, put them into Photoshop and viola, natural (but not great) color, giving some sort of impression of what the make-up for that shot consisted of.
All of these were difficult because either Frederic March and/or the camera were moving around, causing color fringing, but the second transformation in the park yielded very good results, as you can see. I believe there are a number of black and white films that use this gag, but I'd like to generate a list in order to get some feedback for this work.
What say you, folks?