Re: developing cyanotype in acid water

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From: shannon stoney (sstoney@pdq.net)
Date: 04/06/02-01:37:49 PM Z


Tony wrote:

>
>No need to worry unduly. You would require a concentrated mineral acid to
>release the cyanide from the compound, potassium ferricyanide.

Good. I like the way my prints look and I thought I had finally
found the ultimate safe nontoxic process!

>
>Mike Ware in his book on the Cyanotype (ISBN 1 900747 07 3) expounds the
>virtues of developing cyanotypes in 1% hydrochloric or nitric acid, although
>this was with his revised 'new cyanotype' formula.
>
>He extols the benefits of acid development as " a more consistent outcome,
>showing a deeper maximum density and a well shaped characteristic curve,
>with very long printing exposure range of about 2.4 (eight stops)".
>
>Not sure that this would be true of the traditional formula but I would like
>to hear the results of your experiments.

My prints are still wet but I can see that developing in vinegar
water has added at least three steps. I'll let you know when they're
dry.

I liked your web site. I have a lot of bindweed in my garden and I
actually hate it but your print is so exquisite that it makes
bindweed look almost lovable.

--shannon

-- 


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