Re: cyanotype toning

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From: Jonathan Long (fotonerd@yahoo.com)
Date: 04/30/00-02:13:52 AM Z

> A simple toning process that I have used and taught
> for years consists of
> bleaching a cyanotype in dilute household bleach
> (NaOCl) and bringing back
> whatever got bleached away in tannic acid.
>
>......
>
> Sarah Van Keuren

The instructions I followed called for Amonia. Has
anyone done a side-by-side comparison? Bleach/Amonia
then to Tannic Acid. I guess both are a base are they
not. Its been 5 years since I had a Chemistry course.

Thanks.

Jonathan Long
jon@jonlong.com

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