Harman Selenium Toner...

Resoman said:

I thought I'd try the Harman Selenium Toner, instead of the Kodak Rapid Selenium Toner I've always used. The instructions seem straightforward enough except for the part which reads:

"...place the prints in a holding tray of water, approximately 4 C/39 F warmer than the temperature of your working strength solution of Harman Selenium Toner."

I'm not particularly anxious to submit my FB prints to a 110 F bath unless there's a very good reason for this.

Can anyone shed light on this issue?

Thanks,

Gary.
East Snook, TX

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Bob F. said:

It's a typo. It should (probably) say "approximately 4C/7F warmer" - a 4 degrees C change is approx equal to a 7 degree F change so if you are used to using Fahrenheit, the water batch should be 7 degrees warmer. No idea why you would bother with such a small temperature increase though unless you were using the toner above room temp.

Bob.

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Les McLean said:

Perhaps the reason for the batch water to be slightly warmer than the toning solution is to prevent carry over of cooler water and help hold the toner at a consistent temperature. I've done this for years when selenium and gold toning.

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Sanjay Sen said:

Hi Les,

I recall reading that somewhere in Ilford's literature. What is the reason for holding a consistent temperature? Is the toner's activity temperature dependent?


Thanks,
Sanjay

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