Hi there knowledgeable printers. Ilford suggests a CC40 filter when using a cold light head with their Multigrade paper. That is what I use presently. The contrast grades are not evenly spaced. They seem to bunch up from no2 to no6. Somewhere on Ebay there is a color pictu re of an Aristo 14x14 head that looks very green to my eyes. Would a green CC fi lter provide better results than a yellow CC filter? Please help!