Re: New Cyanotype - my first unsuccessful attempt

Sorry for the previous "empty" post.

Even if I agree with you on testing methodology...

James' book say:

"... Mike notes in his book on the New Cyanotype Process that there are
indications the citric acid may make the print more suspectible to fading.
Because of this, he is now, as of 2000, recommending the use of 1% nitric or
hydrochloric acid in place of the citric acid ..."

Even if the "exact cause" of this assumption ("the print may be more
suspectible to fading") is veiled, this is pretty enough for me (a humble
mortal) to reconsider using citric acid for clearing New Cyanotype ;)

Regards,
Loris.

----- Original Message -----
From: "Ryuji Suzuki" <rs@silvergrain.org>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, August 20, 2004 10:21 PM
Subject: Re: New Cyanotype - my first unsuccessful attempt

> From: "Christina Z. Anderson" <zphoto@bellsouth.net>
> Subject: Re: New Cyanotype - my first unsuccessful attempt
> Date: Thu, 19 Aug 2004 14:36:59 -0400
>
> > Next question; why, do you think, or any chemists have a clue, would
> > citric acid cause fading but not nitric or hydrochloric?
>
> Sorry to make it boring, but this seems to be something that should be
> verified for its repeatability first. As far as I saw in this thread,
> there was one anecdotal report and we aren't very sure if this is real
> and indeed citric acid and light are involved.
> ...
Received on Fri Aug 20 16:51:48 2004