Re: Chrome alum sizing

1% chrome alum is very high, it's a 10 per thousand or 5 to 10 times more
than what I have done and read.
Yes, it is very bluish and stains too.
Giovanni

----- Original Message -----
From: <wcharmon@wt.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, August 22, 2005 11:58 AM
Subject: Re: Chrome alum sizing

> I recently did some gumovers with 1% chrome alum and 3% gelatin in the
sizing.
> My experience was mixed. First, I found I had to be very careful about
evenly
> coating the paper, because the sizing has a bluish cast that is quite
> noticeable in any drips and runs. Secondly, it caused MUCH worse
dichromate
> staining, which made it hard to judge how far into the highlights I was
> actually getting some pigment. Fortunately, the staining was easily
removed
> with potassium metabisulfite.
>
> Clay
> Quoting gdimase@hotmail.com:
>
> > Hi,
> > I didn't get any feed back so I went back to the list files since 1996
and
> > did not find too much on chrome alum ratio's sizing.
> > Just sideline comments.
> > As a conclusion it sounds that Jill is right to add a 2 per 1000,
somewhere
> > else I found other people working up to 5 per 1000 and others went down
to 1
> > per 1000.
> > Usually people don't like it when working with gum bichromate
(increasing
> > chrome component and staining) and truly the sized paper doesn't look
smooth
> > and sometimes even dirty.
> > It looks that PVA has a better future against this old chemical mainly
on
> > large prints.
> > Giovanni
> >
>
>
>
>
Received on Mon Aug 22 11:35:17 2005