blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px
#715FFA solid !important; padding-left:1ex !important; background-color:white
!important; } People have been making prints this way for a few years with the
unusual colors and calling them lumen prints. You can find lots of info here.
https://www.google.co.th/search?num=100&newwindow=1&client=safari&hl=en-us&ei=NIGwWMqMEMKAvgT2nYqIDw&q=lumen+prints&oq=lumen+prints&gs_l=mobile-gws-serp.1.0.0l5.48855.52159.0.56297.14.14.0.4.4.0.190.1909.0j13.13.0....0...1c.1.64.mobile-gws-serp..3.10.1107.0..0i67k1j0i131k1.GDUle8LPMrc
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On Saturday, February 25, 2017, 12:34 AM, Laurence Cuffe <cuffe@xxxxxxx> wrote:
On 24 Feb 2017, at 13:17, Margaret H Albertine <salbert@xxxxxxx> wrote:
I use photographic paper in homemade pinhole cameras. Can anyone explain why it
turns colors? My husband has a theory that it’s pollution reacting with the
emulsion. Here’s an example. Sissy Albertine<image001.png>
I like the image! Again my thinking on this is a bit rusty. What we are
looking at here is, I think, colours generated by a process akin to those that
are responsible for the Mie effects (Academic paper here
http://www.dca.iag.usp.br/www/material/akemi/radiacao-I/Mie_Horvath%20(2009).pdf
). In photographic paper we are looking at the effect of a suspension of
conducting particles, however the particles are not necessarily spherical as
Mie had assumed.These effects are related to those obtained in chromoskedasic
printing, of which more
here:http://phototechmag.com/chromoskedasic-printing-revisited/ I trust this ;
helps,BestDr Laurence Cuffe
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Laurence Cuffe
Sent: Friday, February 24, 2017 6:25 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: photo paper in camera? One other interesting thing
I’ve done, is to put a sheet of photographic paper in a large format camera,
and leave it for an extended period, Hours, Days… and the paper darkens without
development. An attempt to develop the image will result in a completely
blackened sheet of paper, but scanning the image without development can result
in quite a subtle image, often with some lilac or yellow tones, even though the
original paper was BW. I think the Darkening is the result of what is known as
physical development, but without going back to the literature, I can’t be
sure!BestLaurence Cuffe
On 24 Feb 2017, at 12:06, Eddy Willems <eddy@xxxxxxxxxxx> wrote: normal paper
is 6 ISO Op 24/02/17 om 08:14 schreef Richard Lahrson:
Dana, What kind of speed? Was the paper VC? Rich On Thu, Feb 23, 2017
at 10:24 PM, Dana Myers <dana.myers@xxxxxxxxx> wrote:
On 2/23/2017 10:21 PM, Richard Lahrson wrote:
Hi everyone!
I was wondering what kind of results one could expect from
shooting photo paper in camera? Is the scale too short to
be useful to scan?
I made several decent contact prints from a paper "neg" in a pinhole camera,
I'm sure I'm not alone. This, of course, suffered from the softening effect
of printing through the paper, which you could surely avoid with scanning,
reversing and inverting the image.
73,
Dana K6JQ
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