Re: Sodium Bisulfite

From: Martin Angerman ^lt;[email protected]>
Date: 08/21/04-02:27:32 PM Z
Message-id: <001701c487bf$3acf8b80$>

The sulfite acts as a reducing agent. It clears the dichromate by reducing
it to an inactive form.

Air can also oxidize sulfite to sulfate, ruining it as a clearing agent.
Therefore, I would not recommend storing it for more than a day. Going from
Saturday to Sunday would probably be OK, however.

My thoughts would be similar to reusing glyoxal and over-using fixer. The
sulfite (and others) are relatively cheap, particularly compared to your
time and other materials. How many people would dilute platinum salts or
short a mixture of good pigment in gum printing, just to save money? The
same applies to the rest of the process.
----- Original Message -----
From: "Darryl Gage" <>
To: "AltPhoto" <>
Sent: Saturday, August 21, 2004 7:06 AM
Subject: Sodium Bisulfite

> After clearing a 2 or 3 gum prints, is the sodium bisulfite solution
> storable for later use or should I just dump it and make a new solution
> when needed? Thanks.
> Darryl M. Gage
> Forestville, NY
> "Strange and beautiful are the stars tonight..." Blue Rodeo
Received on Sat Aug 21 14:45:45 2004

This archive was generated by hypermail 2.1.8 : 09/14/04-09:17:59 AM Z CST