Hi:
Nitric acid is kind of nasty. I've used tannic acid to tone cyanotypes
On Thu, 24 Oct 2002, dennis vinciguerra wrote:
> Hello all,
> Certain cyanotype images work very well in blue, some in brown but then
> there are those that need to be black. The formula I have calls for nitric
> acid but I'm not having any luck locating it. Anyone have either a source
> or another black toning formula ?
>
> Thank you,
> Dennis
>
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Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
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Received on Thu Oct 24 21:20:55 2002
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