RE: Why does cyanotype work?

Barry,

This should surely help:

http://www.mikeware.demon.co.uk/index.html#anchor930646

under

Technical Issues

Chemistry of the Iron-based Processes

Best,

Cor

> -----Original Message-----
> From: Barry Kleider [mailto:bkleider@sihope.com]
> Sent: dinsdag 4 april 2006 15:08
> To: alt-photo-process-l@usask.ca
> Subject: Why does cyanotype work?
>
> I've been teaching a high school chemistry class using the cyanotype
> process as our point for understanding chemical reactions.
>
> We've looked at the iron II and iron III states...
>
> We've talked about how potassium is the marker element for iron...
>
> I'm looking for a way to explain the photo-reactive properties of the
> process. I assume that the image formation is the result of a chemical
> reaction. (Am I right?) What does light do in this process? How?
>
> Is this a simple oxidation process? If we left a piece of treated
paper
> in the dark would it eventually turn blue also? Why does it leave an
> image?
>
>
> Thanks,
> Barry
>
Received on Tue Apr 4 07:17:39 2006