Re: New Cyanotype

From: Judy Seigel ^lt;[email protected]>
Date: 05/19/04-09:04:53 PM Z
Message-id: <>

On Wed, 19 May 2004 wrote:

> Judy,
> When you say the emulsion is too fresh, you said this is the A & B
> themselves. By this I assume you mean that A & B should be mixed and
> then let the bottles sit on the shelf for at least 3-4 days and not use
> them immediately. True?

Yes... we did this as a class project, testing every day supposedly for
the semester... but organization and resolve dissipated . I had found the
initial wash-off in my own studio & thought it would be instructive to
discover the rest... Another variables project was differences in d-max &
clearing when the emulsion has been coated on the paper and stored for a
day, a week, a month (which probably varies by paper, students tested
their own usually).

As for changes in the emulsion as it 'ripens," I found that tones were a
bit lighter and times about 25% longer after several years.... and that
scale improves for about the first week... (Inbetween the first week and
several years, I have little data.)

> Following suggestions I had read on this list, and consulting with a
> chemist friend, I now add about 5 ml of 5% HCl to 2 liters of rinse
> water to neutralize the buffering. (I could easily use other acids, but
> I had 1 gal of muriatic acid for some toning experiments.) I find that
> my wash water is now ALWAYS deep blue, but my images are also a deeper
> blue, and they don't fade away on me. I am slowly experimenting with
> reducing the amount of acid. Also, my solutions have been sitting on my
> shelf for a few weeks, so it is not the case of them being too "young".

As I recall, Mike Ware changed from Citric to Hydrochloric acid for his
New Cyanotype, since he had some suspicions (possibly since resolved)
about archivality after citric.

Received on Wed May 19 21:05:08 2004

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