Archived posting to the Leica Users Group, 1999/04/02

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Subject: [Leica] Photo chemistry, toners, and health
From: bfranson@greennet.net (Bill Franson)
Date: Sat, 03 Apr 1999 07:51:05 +0000
 
At 12:40 PM 4/3/99 +0000, you wrote:
> 
>>> >Some toners, like selenium, can contribute to longevity of prints. I
>>> >believe sepia does not.
>
>I heard that Selenium toning involves handling a toxic chemical.  How
>serious is this threat to human health?

There is a good book out, OVEREXPOSURE Health hazards in Photography by
Susan Shaw and Monona Rossol that covers all the photo chemistry and its
potential effects on the human body. Selenium powders are highly toxic by
inhalation, but it is typically available to the photo consumer in a
concentrated liquid form. It is less toxic by skin contact. Use a chemical
vapor mask, gloves, and good ventilation. The metal toners, selenium,
sepia, gold...., all contribute to the longevity of prints. Tea is a
popular toner these days. It adds nothing to print longevity, but working
with it won't affect yours.  See the work of Tom Baril.

Bill Franson