Re: source for glutaraldehyde & Which gelatine ?

It remains that a good hard photographic gelatine enables one to make
alternative process prints without using hardeners.
 
Both B&S and Silverprint sell one.
 
Try some experiments.
 
Terry
 
In a message dated 06/03/2006 09:40:51 GMT Standard Time, rs@silvergrain.org
writes:

On Mon, 06 Mar 2006 03:39:02 -0500 (EST), TERRYAKING@aol.com said:

> In my experience, if you use a photographic gelatine, which is more pure
> and
> harder than food gelatines, you will not get these problems.

There are great many kinds of photographic gelatins. They vary widely in
chemical, rheological, mechanical (dry), and other properties. There are
also modified gelatins, which are derived from natural gelatin by
attaching some nongelatin molecules at specific places on gelatin
molecules. So, unfortunately, saying "photographic gelatin" doesn't
really tell anything.

> Of course having a fair number of chemistry PhDs among my students helped
> to
> give scientific backing to our experiments.

I live in the city of PhD's and know a lot of chemistry PhD's in many
branches of chemistry, but photographic chemistry is a very highly
specialized branch and most of them know very little about it... in
particular, gelatin chemistry is a very specialized field

 
Terry King FRPS

RPS Historical Group (Chairman)

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

Moderated Discussion Group

Post message: artaltphot@yahoogroups.co.uk

Subscribe: artaltphot-subscribe@yahoogroups.co.uk
Subscribe _PhotoHistory-subscribe@yahoogroups.com_
(mailto:PhotoHistory-subscribe@yahoogroups.com)
Unsubscribe: artaltphot-unsubscribe@yahoogroups.co.uk

1. An excellent thing is as rare as it is difficult.(Spinoza)
2. A man's reach should be beyond his grasp or what's a heaven
for.(Browning)
3. Frustra fit per plura quod potest fieri per pauciora.(Occam's razor or
'Keep it simple!').
4. Nullius in Verba (Horace), 'Take no man's word for it' (motto of the
Royal Society).
5. If ignorance is bliss, why are not more people happy ? (anon)
Received on Mon Mar 6 04:52:25 2006