Re: Paper negatives (Re: Tricolor gum, order of layers)
I will try an exposure comparision between oiled/unoiled paper later and keep you informed. My light source is a Philips Suntan unit with 10 TLK40W/10R lamps, build-in fan and timer, bought cheaply second-hand in a garage sale. Example of a cyanotype print with oiled paper: http://home.versateladsl.be/vt6100419/cyanotype a gumprint: http://home.versateladsl.be/vt6100419/gum and a caseine print: http://home.versateladsl.be/vt6100419/cas Guido 2008/10/6 Loris Medici <mail@loris.medici.name>: > 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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