Re: Stock Paint:Gum Solutions?

[Katharine Thayer <kthayer@pacifier.com>]

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