RE: cyanotype help needed

From: Joe Smigiel ^lt;[email protected]>
Date: 03/24/05-10:13:28 AM Z
Message-id: <>


In my experience the alkali solution and wash bleaches the image beyond
that which the acid will recover. This varies between images/papers but
I've always been able to lighten the image doing this, sometimes too


>>> 03/24/05 8:47 AM >>>
Joe, doesn't it gain its old density (or very close to it)? When you
acidify I mean?

> -----Original Message-----
> From: Joe Smigiel []
> Sent: Thursday, March 24, 2005 3:44 PM
> To:
> Subject: Re: cyanotype help needed
> Jan,
> Any alkaline solution would probably reduce the density of
> the cyanotype and also lower the contrast. I've used weak
> ammonia solutions, borax, and even dilute film and paper
> developers to bleach back cyanotypes.
> They will turn a lovely lavender color as they bleach. Go
> slow using weak solutions in order to gauge the bleaching
> effect with some precision. I would try a test on a similar
> piece of printed paper in order to determine the proper
> strength solution to use. After rewashing the print I always
> acidify it again using weak acetic or citric acid and this
> returns it to a blue color.
Received on Thu Mar 24 10:56:52 2005

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