Re: Cyanotype with Oxalic

There is an article on cyanotype formulae at unblinkingeye.com. Two mention
oxalic acid.

http://unblinkingeye.com/Articles/Cyano/cyano.html

----- Original Message -----
From: "Venkatram Iyer" <eyeear@telus.net>
To: <alt-photo-process-l@usask.ca>
Sent: Friday, April 07, 2006 10:03 AM
Subject: Re: Cyanotype with Oxalic

> Kai,
> Just how much oxalic is added per ml of emulsion? and by how much is
> the exposure reduced due to increased light-sensitivity?
> TIA, Rajul
>
>
> On 7-Apr-06, at 7:02 AM, Kai Hamann wrote:
>
> > Hello Michael,
> >
> >> What's the idea behind some recipes adding a pinch of oxalic acid to
> >> traditional A:B cyanotype? Change of colour? Speed? <
> > The oxalic acid makes the mixture more light sensitive and prevents
> > blue staining of the highlights.
> >
> > All the best
> > Kai
> >
> >
>
Received on Fri Apr 7 10:24:53 2006