Keeping times

John Fontana

Member

Joined

Sep 1, 2005

Messages

16

Format

4x5 Format

• Dec 28, 2007

• #1

Can anyone give me an idea of the shelf life of citric acid, and EDTA/Sulphite mixes, used for clearing of prints in the Ziatype process?
Many thanks
John

 

Jim Noel

Member

Joined

Mar 6, 2005

Messages

2,261

Format

Large Format

• Dec 28, 2007

• #2

I don't worry about keeping times. It is so easy and cheap to mix these that I do so fresh each time I work. I never carry over either of these chemicals from one session to another. When using them for a class I sometimes mix up enough to last for a month, but we still do not re-use them.

 

ann

Subscriber

Joined

Sep 10, 2002

Messages

3,336

Format

35mm

• Dec 28, 2007

• #3

or you asking about dry chemicals?

 

OP

OP

John Fontana

Member

Joined

Sep 1, 2005

Messages

16

Format

4x5 Format

• Dec 31, 2007

• #4

I was meaning when mixed with water. I ask because although I agree citric acid and sodium sulphite are cheap, the EDTA Disodium I bought here in the UK was not.