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

Re: Stock Paint:Gum Solutions?



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)."

Katharine




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.

Katharine




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.

http://kremer-pigmente.de/shopint/index.php?cat=0207&product=67760
product info pdf: http://kremer-pigmente.de/shopint/PublishedFiles/ 67700-67790e.pdf

http://www.kuraray-kse.com/start?open&&4
product info pdf: http://www.kuraray-kse.com/all/Portfolio_E/$File/ PVA_Standard_2008-08.pdf


kees