RE: Nuarc and print contrast question

Sorry, now I realize that you need something else:

There's not a quantitative study on how those parameters absolutely
affect contrast in the first book (but the rules and how the system
works and practical information is presented in detail), don't know
about the second. I think what you want is something very hard to since
the pigment(s) and pigment concentrations you may use are important
parameters / there are virtually infinite combinations...

There's also a book from someone named J. Kosar which AFAIK is more
scientific and includes a section on "dichromated colloids" -> I'm sure
those who have this book will provide you more definite / detailed
information.

Book info:
Kosar, J. Light Sensitive Systems: Chemistry and Application of Non
Silver Halide
Photographic Processes. John Wiley and Sons, New York. 1965
(taken from "The Chiba System" book)

BTW, one more source:
http://www.noloft.com/carbon/papers/TheChibaSystem.pdf
The writer (Halvor Bjoengaard) is a scientist.

Regards,
Loris.

-----Original Message-----
From: Loris Medici [mailto:mail@loris.medici.name]
Sent: Wednesday, April 11, 2007 8:12 AM
To: 'carbon@spitbite.org'
Subject: RE: [carbon] Nuarc and print contrast question

Hi Peter,

See:

* http://www.alternativephotography.com/books/sk_carbon_carbro.html
        (I have this and it's a wonderful source of information - highly
recommended...)
*
http://www.bostick-sullivan.com/cart/product.php?productid=702&cat=31&pa
ge=1
        (I don't have this - can't comment...)

Hope this helps,
Loris.

-----Original Message-----
From: petercane@comcast.net [mailto:petercane@comcast.net]
Sent: Tuesday, April 10, 2007 7:11 PM
To: carbon@spitbite.org
Subject: [carbon] Nuarc and print contrast question

Sandy:

First I'd like to thank everyone here for the wealth of information made
available by this list.

I have a question for for the group; I'm looking at a Nuarc plate burner
and it seems it might be just the ticket, it incorporates a vacuum
frame, intergrator and a light source. Other posts of yours seem to
indicate that you may own one. I do have a few questions regarding its
use: what do these things weigh? How big are they? In what manner does
the intergrator work, does it measure in candle feet? Can I use this
with the power supplied by a wall socket in my home (USA)? What kind of
light source are they built around? I'm sorry for the machine gun blast
of questions.

One final question though, so far from what I've read, amount and
opacity of pigment , senitiser strength, gelatine thickness, light
intensity and negative contrast and density all effect the final print
contrast. Can anyone point me in the direction of a paper or study that
systematicly explains these issues as it relates to carbon printing that
can provide repeatability?

Thanks

Peter Cane
Annapolis MD

-------------- Original message --------------
From: Sandy King <sanking@clemson.edu>

> Loris,
>
> I am not sure what you mean? The synthetic base I use to make tissue
> is usually Yupo. If you mean the temporary support used for double
> transfer work, that is a 30 mil polyvinyl.
>
> Best
>
> Sandy
>
>
>
>
> At 2:28 PM +0300 4/10/07, Loris Medici wrote:
> >Sandy,
> >
> >What is the thickness of the PVC sheets (I guess you mean PVC when
> >saying polyvinyl) that you use to get a mirror-like and dust-free
> >surface for your tissues?
> >
> >Thanks in advance!
> >
> >With greetings and warmest wishes from Istanbul,
> >Loris.
> >_______________________________________________
> >Post to the list as PLAIN TEXT only - no HTML
> >carbon mailing list
> >carbon@spitbite.org
> >FAQ at http://spitbite.org/carbon/list.html
> _______________________________________________
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Received on Tue Apr 10 22:31:36 2007