U of S | Mailing List Archive | alt-photo-process-l | Re: Stock Paint:Gum Solutions?

Re: Stock Paint:Gum Solutions?

To Loris, re Mike Ware's PVA information:

Darn, I was hoping it would mean something to you, because it doesn't mean much to me either. Maybe if I went back and went over my notes from the time when I was studying research on PVA in dichromated colloid processes, it would jog my memory. If so, I'll let you know.

Someone once pointed us to a great site that went over all the different variables in PVA variability and explained what each of them meant, but the last time I activated that bookmark, that information was no longer there.

On Oct 24, 2008, at 10:04 AM, Katharine Thayer wrote:

I found the information from Mike Ware on PVA for Loris:

"We found an 88% hydrolyzed PVA, with an RMM around 25 kd in 20% w/ v solution to offer the best all-around results--comparable to 14 Baume' gum."

"If you make any public use of this information, please cite it as follows: Stephen Beckett, M. Phil. Thesis, University of Derby (UK) November, 1993, (A private communication from Mike Ware)."


On Oct 24, 2008, at 7:39 AM, Katharine Thayer wrote:

One of Mike Ware's students figured out what the best PVA is to use for dichromate colloid process. I have the information in a file somewhere and will look it up later day if I have time.


On Oct 24, 2008, at 12:53 AM, Kees Brandenburg wrote:

On 24 okt 2008, at 09:31, Loris Medici wrote:

Of course, still, there's the problem of gum not being a defined compound
(it can change depending on source and year of harvest). Therefore I'm
interested in synthetic alternative such as PVA. I haven't find a good
source of suitable PVA, plus, I'm not completely sure which kind of PVA is
most suitable for our purposes. As soon as I figure these out (source and
type), I'll leave gum aside and use PVA as the colloid. (My current
understanding is that something like 85% hydrolized, with a molecular mass
around 10 - 12.000 should do well... Any thoughts?)

Hi Loris,

You can try Mowiol. You find some information at the Kremer Pigmente site and on the site of the manufactrer Kuraray.

product info pdf: http://kremer-pigmente.de/shopint/ PublishedFiles/67700-67790e.pdf

product info pdf: http://www.kuraray-kse.com/all/Portfolio_E/ $File/PVA_Standard_2008-08.pdf