From: Judy Seigel (jseigel@panix.com)
Date: 10/15/02-10:56:16 PM Z
On Tue, 15 Oct 2002, Liam Lawless wrote:
> Maybe irrelevant to the present enquiry, but try if you don't believe.
> Buffered paper may be bad, but seems that acid would be, also. And yes,
> alum is acidic.
Liam, I did this 15 years ago and it's no longer clear in memory (tho I
did write it up, as I recall, in the Post-Factory cyanotype issue) -- I
coated regular paper with various acids at various strengths and let dry
before coating with cyanotype.
In many/most cases the print was significantly improved -- deeper tone and
longer scale. I think acetic was one of them, but others as well and I
began doing it when I thought of it. I didn't think to use oxalic -- but
didn't someone on list recently mention coating paper with 1% oxalic acid
before making platinum print?
In any event and however, adding acid to the emulsion and coating the
paper with acid are not same thing -- although it occurs to me now that
one of the most widely used cyanotype formulas has got oxalic acid in both
A and B parts. See pages 32 and 33 in Post-Factory #5.
My tests showed that although this formula gave more intense blues the
first few days, it didn't keep well, and by a couple of weeks the
highlights were veiled. I called it OX-2, "the *other* cyanotype"
formula. But it's the main one given in several fancy texts... including
that English guy turns out a "handbook" every minute, what's his name ?
Judy
>
>
>
> Liam
> -----Original Message-----
> From: David Eastman [mailto:clearemulsions@yahoo.com]
> Sent: 15 October 2002 06:17
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Problem with cyanotype: Laim...Judy?
>
>
> Judy-
>
> The reason I did not ask if Laim made a boo boo was
> because I don't think he did. I tend to think Laim is
> right in suggesting that acid in the system promotes
> the reaction and causes instaneous blueing.
>
> On the other hand, I am not sure, because, as you
> eagerly echoed my own admission, I do not make
> cyanotypes.
>
> It was and is my sole desire to ELICIT CLARICATION of
> a point which, even as I stand on my head, cross my
> eyes and look at this in a mirror, still seems to be a
> discrepency between two very knowledgeable people; one
> rather quiet, and the other, well, less so.
>
> OK?
>
> It seems to me that perhaps there is more than one
> process being discussed here...Image Formation and
> Image Preservation.
>
> Perhaps your "Cyano doesn't like alkali. Acid is
> OK." was a bit anemic.
>
> We are all here to learn, right?
>
> Please don't take it personal.
>
> Ray
>
>
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