William Laven (wmlaven@platinotype.com)
Fri, 09 Apr 1999 17:40:30 -0700 (PDT)
>..well if you copper or iron tone you form a coloured pigment at the
>expense of the metalic silver, so there isn't much left to protect with
>either selenium or sulphide toning, these formed pigments are (much?) less
>stable than the metalic silver (info from an article generously provided
>by Richard Knoppow). You can first (slightly) tone with selenium
>(protecting the shadow parts) or Thiourea (protecting the highlights) and
>tone secondly with copper or iron or both (but this still leaves you with
>a less stable pigment), but the effects can be quite interesting..
I don't know what techniques Emmet Gowin used on his aerial photos of
mining operations, but I know he used come exotic toners including copper.
The prints are gorgeous; they're silver. If anyone knows more of his
techniques, please share it. And if you ever get a chance to see the work
in person, by all means do.
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WILLIAM LAVEN PHOTOGRAPHY
Workshops and tutorials in Platinum/Palladium printing and Zone System.
1931 23rd Street, San Francisco, CA, 94107
415-647-9432 (voice) 415-647-9438 (fax)
wmlaven@platinotype.com
http://www.platinotype.com
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