Re: Ruined 3rd tricolor gum print! Grrrr...
Thank you all people! Now I'm getting somewhere; indeed, the pigment was too much... I did another test print, see the progress below: http://www.loris.medici.name/gum/phtalo/ I think I can still cut some more pigment. The result is still too - not dark but let say -> low contrast. Of course, one reason of this is the fact that I'm using paper negatives -> those give low contrast because of the paper's texture. Will make another try (after finishing this one) using less dichromate (10% instead of 20%) and slightly more exposure (19mins, ~ +1/3 stop) and see what happens. I think I can use slightly more contrast in the shadows. Thank you all again! I liked much Keith's approach and will continue that way. Katharine's explanation about her workflow is also logical and was noted. I noted Chris' "dilute the coating solution" suggestion too and may try it later according to the current situation... Please provide your comments about the images above. Thanks in advance & best regards, Loris. 22 Eylül 2008, Pazartesi, 6:50 pm tarihinde, Katharine Thayer yazmış: > P.S. Looking at the amounts (before, I was looking only at your > description of the effects) I'm even more sure about the pigment. If > you're using the same amount of thalo as PV19, it's most probably too > much thalo. As I think I said a day or two ago in a different > context, PV19 isn't nearly as strong as thalo. Hope that's helpful, > kt > > > > > On Sep 22, 2008, at 8:04 AM, Katharine Thayer wrote: > >> My first thought, without seeing the thing myself, is that you're >> using too much thalo; the flaking, the uneven coating, the >> overwhelmingness that you describe (though I might be >> understanding that different than you're meaning it) all suggest >> too much pigment. I could be wrong; I'd have to see it for myself >> to know for sure. >> >> In my experience, a cyan-last order works best, because with the >> yellow and red already down, you can watch the color balance and >> tonality while developing and take it out when it's "right;" in >> other words it's easier to get it right on the first try printing >> cyan last. >> Katharine >> >> >> >> On Sep 22, 2008, at 6:34 AM, Loris Medici wrote: >> >> >>> Hi all, >>> >>> I'm trying tricolor gum printing using plain paper negatives. >>> >>> I start with yellow (Schmincke 208 Aureolin Modern PY151 >>> Benzimidazolone), >>> then I print the magenta (Schmincke 351 Ruby Red PV19 Quinacridone >>> Red) >>> and everything (tonality, smoothness, color) is good & nice up to >>> here... >>> >>> As the last layer, I print the cyan (Schmincke 479 Helio Cerulean >>> PB15:3 >>> Phtalocyanine Blue) and somehow it's too overwhelming, very >>> uneven, and it >>> flakes like crazy! >>> >>> Pigment amounts are as following: >>> 1. Yellow, pea sized, into 3.75ml gum + 3.75ml dichromate >>> 2. Magenta, lentil sized (read as: half of yellow), same as 1 >>> 3. Cyan, lentil sized (same as magenta), same as 1 >>> >>> Exposure times and dichromate amounts are the same for all three >>> layers >>> (15mins., 20% ammonium dichromate). I use automatic development >>> for 30 >>> minutes, sometimes a little longer according to how it looks. >>> >>> I don't know why I'm having this problem but will try to (all >>> together): >>> a) Print in the opposite order (1. Cyan, 2. Magenta, 3. Yellow) >>> b) Use even less cyan pigment to match the color intensity of >>> previous layers >>> c) Try to not panic while struggling to coat an extra even cyan >>> layer... >>> >>> What can you say? Any ideas on why I'm stuck that way? >>> >>> Thanks in advance, >>> Loris. >>> >>> >>> >>> >> >> > >
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