Re: muddy gum print--help?
I found that printing magenta after yellow helped a lot in improving the overall look of a print. The yellow seemed to veil the print if printed last, even though there wasn't a noticeable yellow cast. Best wishes Henry On 12/4/09 20:32, "Charles Ryberg" <cryberg@comcast.net> wrote: > Folks: > > Thanks for your help. I'll reprint Monday (as I mentioned yesterday I > stupidly ruined the example I posted). > > Does the order of printing matter? The example was Cyan, Magenta, Yellow. > > I can't size--asthma keeps me away from VOC's and my urban loft provides no > back yard or garage with fan. > > I use Fabriano Artistico Hot Pressed--it seems to stain less than Arches. > > My Lukas Process Magenta (PG2) does stain, though not as much as some of > the other magenta/reds I have tried. My Daniel Smith Hansa Yellow Medium > (PY3) stains too. The Daniel Smith French Ultramarine (PB29) stains very > little. > > I did a curve for each pigment at a concentration which seemed to me to be > the most pigment I could use. Prints made with those concentrations and > curves were even worse than the one I posted. Trial and error led me to > pigment concentrations of about 70% of maximum and exposure time of about > 80% of what I had determined ³scientifically.² I suppose I could post the > curves if you think it would be helpful. I use potassium dichromate on the > cyan and magenta, ammonium on the yellow due to excessively long times with > yellow and potassium. > > Exposure is BL tubes. Timer is GraLab. Registration pins by Pro Art > (that's supposed to be a joke). > > Any help before I reprint (a better magenta? a different printing order?) > would be welcomed. > > Any help after I reprint, of course will be also welcomed. > > Charles Portland, Oregon >
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