Re: source for glutaraldehyde & Which gelatine ?

 
 
 
Chris
 
Clearly I do not know if this is the case but it sounds if you are using the
wrong gelatine.
 
In my experience, if you use a photographic gelatine, which is more pure and
harder than food gelatines, you will not get these problems.
Of course having a fair number of chemistry PhDs among my students helped to
give scientific backing to our experiments.
 
When I started in in alternative processes many years ago I set out to
simplify the overcomplications which had built up in the manuals. Among the things
we found were that you do not need hardeners and that gelatine, in the right
proportions for sizing, gives perfectly good platinum prints, which means,
of course, that gelatine sized papers are perfectly good for platinum
printing.
 
The only time I seek to change gelatine is when I dichromate it when making
a substrate for gum printing.
 
Terry
 
 
In a message dated 04/03/2006 15:51:28 GMT Standard Time, zphoto@montana.net
writes:

Terry,
This is an interesting proposition...but I find that if the hardener is
omitted, even in room temperature water development, the gelatin gets slimy
to the touch, sloughs off, and the print stains very easily. I'm intrigued
that you don't find this to be the case.
Chris

> People will find it a useful exercise to omit hardeners from all those
> processes in which they use them. They will find that they work just as
> well.
> Terry

Terry King FRPS

RPS Historical Group (Chairman)

_www.hands-on-pictures.com/_ (http://www.hands-on-pictures.com/)

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Received on Mon Mar 6 02:39:21 2006