Re: Bleach-development with gum
Hi Keith, Yes it applies to multi-layer prints on Masa too. But I think there's something wrong with my sizing method; I normally size using a 3% 250 Bloom gelatin - sizing + hardening are both done in the same time (I add 1ml formalin per 1g of gelatin into the solution before applying it to the paper). I decided to use a lower gelatin concentration after Christina's advice of brushing harder and working the sizing into the paper's fibers - as I understand it. Perhaps the higher concentration (combined with hard gelatin) was making the surface too slick as Christina suggested. Anyway, I just finished sizing few 1/4 sheets of Fabriano Artisico (no Traditional and/or Extra White designation on the packaging) with 1% gelatin, brushing vigorously -> will report how it went... BTW, the bleach developed print also was done on unsized Fabriano Artistico. Another note: Unsized Masa stains! (Fabriano too, but much less compared to Masa...) So try it both sized and unsized, see for yourself. I may also size few sheets of Masa later (with the new 1% concentration) if all goes well with Fabriano. Regards, Loris. From: Keith Gerling <keith.gerling@gmail.com> Reply-To: <alt-photo-process-l@usask.ca> Date: Thu, 06 Dec 2007 11:59:50 -0600 To: <alt-photo-process-l@usask.ca> Subject: Re: Bleach-development with gum Hi Loris, I'm finally getting around to working with Masa. I noticed in this post that you say you do not size? Does that apply to your multicoat prints on Masa as well? I've spent a solid morning in a frigid workroom shrinking and affixing Masa and I don't want to mess it all up. thanks Keith On Dec 1, 2007 11:02 AM, Loris Medici <mail@loris.medici.name> wrote: > Katharine, > > I got much better results - but there's still plenty of room for > improvement methinks, will share them soon... > > But, the bleach I use is 55% sodium hypochlorite, not 5% as yours > (many sodium hypochlorite based bleach brands in Turkey are 55%). > > For bleach development, I use 2x the amount of pigment I would > normally use, I cut the dichromate to 1/2x (5%), and exposure is > around 3x (or 4x if I find the coating is on the thick side). > > I use 20ml of 55% bleach per liter of water. I first rinse the print > to get rid of the dichromate then put into bleach for 1 minute (face > down), then I put into development water for 10 minutes, then I > evaluate the print and put into bleach for another minute - if it acts > in a lazy manner - and continue to develop in water. > > Actually I did a wonderful print yesterday but ruined it later because > I was a little bit impatient and pulled it early in development (I > should give it 5-10 minutes more) and when I left it for drying (flat) > I got serious stain (in form of bleeding). > > I get best results on unsized paper. I get flaking with sized paper - > I don't know why!? I never managed to make an acceptable print on > sized paper (both 3% and 6%, hardened with formalin) - kind of a curse > I guess... > > Anyway, even if the results are very good considering they're one-coat > gums, their Dmax is still less than what I get from properly done > 3-coats... Will try harder. > > Regards, > Loris. >
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