Re: Paper negatives
Indeed, unoiled negatives require a longer exposure time. If there are people like me who doesn't like to deal with oiling (because while working I can put my negatives everywhere; on my printer's output tray, on my keyboard, on my coating area ect. ect. and I'm kinda fastidious) then you can just purchase a much thinner paper (such as freedompaper.com's 18 lb translucent inkjet bond) and get rid of the extra step + extra care you need with oiled negatives - with even shorter exposure times. For instance, my exposure time with unoiled ordinary 80gsm photocopier paper was 15 mins (20% dichromate), with the thinner paper it's just 6:30 (10% dichromate), unoiled. That makes something like 1.3 stop - without taking the halving of the dichromate into consideration (= actual / practical difference is more). Plus, in my case the translucent inkjet bond is much cheaper than Epson paper (BTW, I use 13x19" sized sheets - I don't even know if Epson is offered at that size?) therefore I will continue that way, which I found more convenient / logical for myself. Thanks for taking the burden / sharing results. Regards, Loris. 12 Ekim 2008, Pazar, 1:12 pm tarihinde, Guido Ceuppens yazmış: > Laura, > I like the image but I think the second one (un-oiled paper) needed > far more exposure. > I tried a quick exposure comparison between oiled and un-oiled Epson > PQP, using a 31 step tablet and cyanotype. For my setup I found a > difference of 2.5 stops: > oiled PQP : exposure 8 mins, > un-oiled PQP : exposure time 48 mins > I did not make a complete image as I cannot see any advantage in using > un-oiled paper, the extra (not too messy) step does not, FOR ME, > warrant the extra exposure time needed for each negative, especially > in multy-layer gum. > Greetings, > Guido > > > 2008/10/12 Laura Valentino <laura@this.is>: >> I never got a clear answer about whether it is possible to use the Epson >> photo quality inkjet paper as a negative un-oiled, so I did a little >> test :) >> >
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