Re: Paper negatives (Re: Tricolor gum, order of layers)
I'm really curious about your exposure times with unoiled negatives, thanks for taking the trouble... BTW, what light source do you use? Those cyanotype exposures are pretty short, I never managed to get the exposure below 8-9 minutes with the most transparent media I have on hands. (Ultrafine, w/ Pictorico it's a little more...) Regards, Loris. 6 Ekim 2008, Pazartesi, 2:48 pm tarihinde, Guido Ceuppens yazmış: > Loris, > I can only report on my own findings, other people may work differently: > - my cyanotype exposure with an Agfa Scanjet negative : 2 min 30 sec > - my cyanotype exposure with an Epson Photo Quality Paper negative, > oiled : 7 mins > - my gum exposure with an Epson Photo Quality Paper negative, oiled : > 2 mins to 3:30 mins > - my caseine exposure with an Epson Photo Quality Paper negative, > oiled : 40 to 60 secs > I never tried exposure with un-oiled Epson Paper. Later tonight I will > upload an example. > > Greetings, > Guido > > > 2008/10/6 Loris Medici <mail@loris.medici.name>: >> Guido have you compared the exposure time with un-oiled negatives? Have >> you noticed any mottling and/or unevenness? >> >> Your and Katharine's experience definitely contradicts with what was >> reported by Judy and/or the actual writer(s) of the article in Post >> Factory Photography - causing confusion on my part. >> >> I have only used baby oil (liquid paraffine) once, and the paper was >> different few days later... Maybe there's a huge difference between >> very >> little and too much!? >> >> Regards, >> Loris. >> >> >> 6 Ekim 2008, Pazartesi, 1:13 pm tarihinde, Guido Ceuppens yazmış: >>> ... >>> I completely agree with Katharine's post: I no longer bother with the >>> mylar separation sheets and have used oiled negs after approx. 2 years >>> with the same exposure times, the paper feels only slightly greasy.
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