Amongst my dad's things was a Kodacolor filter set. The camera was optimized for 16 fps, so 1/30th shutter speed with a max aperture of f1.9. The inclusion of the ND filter has always struck me as a bit odd, given prevailing film speeds in the late 1920s and the color filtration already required by the K-D process.
Update: I found this blurb online, which explains the use of the ND filter.
A 3 banded filter that went on the end of the camera lens. It ONLY fit when the aperture was fully open at f1.9. While the ads suggested shooting things like flowers, bright colors and children playing outside, the truth was the filter-especially the blue, needed a ton of light. The only way to control exposure was neutral density and an exposure ratio diaphragm that came with each roll of film.
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