Re: Cuprotype

[Bruce <steelbar@shaw.ca>]

Hi Alberto
I don't think that the Arches Plantine has an Alkaline buffer but  
from Christines latest posting you may have the answer to my problem.  
I didn't use acetic acid in the wash so I will try that, as well as I  
will try Jim Patterson's suggestion of citric acid.
Thanks
Bruce

Quote from Christina Z. Anderson email
> > > The WASH of dilute acetic acid is to remove the ferricyande toner  
> > > out of the paper.  If ferricyanide is not removed from the paper,  
> > > it auto- decomposes after some time to iron ferricyanide, the  
> > > blue stain.  If your tap water has iron, use distilled water.   
> > > Also a 1% citric acid wash may work better than the acetic acid  
> > > wash.
> > >
> > > Thanks,Jim Patterson
On 20-Jan-09, at 12:29 AM, Alberto Novo wrote:

> > ... It still  could be the clearing time and I am just having  
> > trouble clearing the  Iron out of this paper. I was also wondering  
> > if I have Iron in the  wash water. I live in a large city and have  
> > been using tap water for  the final wash.
> It could be also some iron left in the paper due to its alkaline  
> buffer.
> Try also to acidify the paper -and let it dry- before the coating,  
> for example with the same solution used for the washing bath (0.5%  
> acetic acid).
> Alberto