RE: Dark reaction in dichromated colloids

Yes, gelatine can't be frozen in foodstuff applications so I don't think
it could be frozen in photography - I think that's why you can't freeze
liquid silver emulsion to keep it longer. I have (inadvertently) frozen
gelatine and think it destroys the cell capsules, causing it to break
down into a sludge....
Kate

Kate Mahoney Photography

-----Original Message-----
From: Katharine Thayer [mailto:kthayer@pacifier.com]
Sent: Saturday, 12 June 2004 11:32 p.m.
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Dark reaction in dichromated colloids

Ender100@aol.com wrote:
>
> What happens if you freeze it?
>

According to Kosar, the Lithographic Technical Foundation "reported that
the thermal reaction on dichromated-albumin and dichromated-gum arabic
deep-etch plates can almost be stopped when the plates are stored at 38
degrees F (3.3 degrees C) and 72% relative humidity. However, a small
drop in gamma can be expected after sensitized materials have been
stored at low temperature for a prolonged period." This isn't freezing,
but it's close. I have a feeling freezing wouldn't work for most
colloids; I'm thinking from my experience freezing jello by mistake
once (I was trying to chill it in a hurry and left it too long).
kt

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.701 / Virus Database: 458 - Release Date: 7/06/2004
 
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.701 / Virus Database: 458 - Release Date: 7/06/2004