I have been looking into green or light yellow/green filters to deal with foliage (in black and white.) I came across a light yellowish-green filter, a Kodak Aero No. 1 filter, size series VI. I have been searching around and cannot find any info on it. Has anyone ever heard of an Aero filter? There is a blue one for I think infrared, but this is not that filter. Thanks you! Robbie