U of S | Mailing List Archive | alt-photo-process-l | Re: gum preservatves

Re: gum preservatves

Thanks, Dirk-Jan, for the heads up -- I wasn't going to use it, but I was probably going to dispose of it casually. However it really is a small amount -- maybe 15 cc... Meanwhile, and also -- I haven't the foggiest idea where it came from or how it got into my cabinet, where it has rested AT LEAST 10 years...


On Thu, 4 Sep 2008, Dirk-Jan Treffers wrote:


MEK peroxide is a synonym for methyl ethyl ketone peroxide. Seriously
dangerous stuff:

I advise to not use this stuff, as thymol is a far safer preservative.
Or try the other options mentioned by others in this discussion list.
If I were you, I;d get rit of the bottle and hand it over to local
authoryties that collect chemical waste from households. Peroxides,
especcially those who have been on the shelf for several years, can be
very instable. Some of them even explosive. Not to scare you, of
course, just to give a warning to be carefull whith this stuff....
I've studies chemistry, and have seen more than one accident happen
whit chemicals that were disposed of in the inproper method, or used
in a way they shouldn't be. No serious damage came from these
accidents. But better be safe than sorry!

kind regard,


2008/9/4 zphoto@montana.net <zphoto@montana.net>:
Lemon juice does the trick and was Demachy's method in 1897.

----- Original Message Follows -----
From: davidhatton@totalise.co.uk
To: alt-photo-process-l@usask.ca
Subject: Re: gum preservatves
Date: Thu, 04 Sep 2008 16:18:47 +0100

<br />
Hi Loris,
Is there any reason one can't add some acid to the mix,
Oxalic or citric say, to give an increase in printing
speed? You could have a non-smelling acidic mix then.. </p>
David H

Assistant Professor of Photography
Photography Option Coordinator
Montana State University
College of Arts and Architecture
Department of Media and Theatre Arts, Room 220
P.O. Box 173350
Bozeman, MT 59717-3350
Tel (406) 994 6219