3 monochrome shots, one filtered red, one filtered yellow, one unfiltered
edited in rawtherapee then loaded into gnu imp. subtracted red shot from yellow shot to produce a psuedo green image, then subtracted the red and pseudo green from the unfiltered to produce a psuedo blue image, then composed the three as RGB. phone photo of the scene is attached. I moved my camera slightly and fucked up the focus when unscrewing a filter so it ain't perfect but it is surprising how "accurate" the colors came out.