Re: Paper negatives (Re: Tricolor gum, order of layers)
Every now and then I want to do something other than the traditional gum and realy splash color around.... The image is first overdone in PS and then printed as "colorfull" as possible. I think casein can reproduce the same subtle tones as gum but sometimes that is not wat I want! Guido 2008/10/6 Loris Medici <mail@loris.medici.name>: > Thanks much, I like the cyanotype very much. The gum also is lovely / very > sentimental (both subject + technique). Can't say the same thing about the > casein print though - it looks like a screenprint; very opaque, looks like > made with spot channels, poor tonality... Probably because of acrylic > paint + hazy casein...??? Is it that image particularty or a general > property of all acrylic paint + casein colloid images? > > Thanks for sharing these. Take your time about the exposure test, I'm sure > it will be helpful to us if you can make it... > > Regards, > Loris. > > > 6 Ekim 2008, Pazartesi, 7:56 pm tarihinde, Guido Ceuppens yazmış: >> 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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