Re: New Cyanotype - my first unsuccessful attempt

----- Original Message -----
From: "Scott Wainer" <swphoto@verizon.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, August 19, 2004 1:07 PM
Subject: Re: New Cyanotype - my first unsuccessful attempt

> It may have to do with the chemical structure of the new
formula. As Dr.
> Ware points out in his book on cyanotype, the new formula
forms a lattice
> structure that can hold and bind other chemical molicules.
It may be that
> citric acid is retained and reacts with the chemistry or
the paper over a
> period of time and causes fading. Nitric and hydrochloric
acids might not be
> retained as strongly as citric acid and therefore cause
less fading. I am
> not a chemist so this is all conjecture on my part.
>
> Scott
>
>
   Well, I am NOT a chemist but Citric acid is a well known
sequestering agent so that might have some effect. Just a
guess. Lemon juice works well for cleaning mineral deposits
off pots and kettles, perhaps it also has an effect on
metals. In any case Citric is an organic acid and the others
are not, perhaps irrelevant.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com