I've located a source for very inexpensive filters that appear as if they'd be usable for multi-contrast, split-filter, and potentially even color printing (though color isn't a good option with my present cold light setup). That source is Lee Filters: http://www.leefilters.com/home.asp I'm in process of locating a local dealer, but it appears they sell a half sheet, 20x24 inches, for about $8, and they have filters that mimic CC spectra in red, blue, green, cyan, yellow, and magenta -- the ones I'm interested in, yellow and magenta, up to 50cc density. One half sheet will make about a dozen 6x6 inch above-negative filters -- pretty decent pricing! I understand that in order to get extreme high and low contrast with multigrade papers (ideally, I'd like to get from 00 through 5, but I'm not sure how much of that range will be realizable from a Zone VI cold light), I might need as high as 140cc -- am I correct in thinking that stacking multiple layers of filters would increase the density arithmetically? If not, is there a factor I could use? Alternately, where might one locate 00 and 5 filters in 6x6 inch for a good price, ready to use?