Viradon lifespan

titrisol

Subscriber
Joined
Aug 2, 2004
Messages
2,067
Location
UIO/ RDU / RTM/ POZ / GRU
Format
Multi Format
I have used it for up to 4 weeks (storing in bottles between sessions).
The more used it gets, the fastest it is and the lightest brown it gives.
 

Ole

Moderator
Moderator
Joined
Sep 9, 2002
Messages
9,244
Location
Bergen, Norway
Format
Large Format
At least two years - will let you know when I have to mix new
 

john_s

Subscriber
Joined
Nov 19, 2002
Messages
2,120
Location
Melbourne, A
Format
Medium Format
I recently used some for only a few sheets and put it in a bottle. It was stored in darkness. When I came to use it maybe a month later, it had a scum which I think was probably elemental sulphur. The Viradon might have been contaminated with a very little sodium sulphite, since I put one print back in the toner after rinsing in it and deciding to give it a little more toning. Would that have caused the breakdown?
 

Ole

Moderator
Moderator
Joined
Sep 9, 2002
Messages
9,244
Location
Bergen, Norway
Format
Large Format
john_s said:
The Viradon might have been contaminated with a very little sodium sulphite, since I put one print back in the toner after rinsing in it and deciding to give it a little more toning. Would that have caused the breakdown?
Click to expand...

Could well be. Viradon is sodium polysulfide, which will react with sulfite to gice thiosulfate and sulfur. It will decompose all by itself as well to give sulfur, or with oxygen to give sulfite and sulfur - and thus thiosulfate and more sulfur, which reacts with oxygen to give sulfate and even more sulfur...

It basically reacts with anything, and gives sulfur as a result. But it lasts for a very long time if you can keep "anything" out of it.
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…