RE: acid pre-soak

Judy, are you using digital negatives or printing in-camera negatives? If
you're using digital negatives try to calibrate without using acetic or
citric acid. These acids both changed the color of my cyanotypes (no lovely
prussian blue anymore, something else) on every paper that I was using (not
many though). I didn't like the resulting colors. I also found that midtone
separation is affected negatively. I happen to like the relatively high
contrast nature of cyanotypes, so acid treatment is not my cup of tea.

Regards,
Loris.

-----Original Message-----
From: jude.taylor@comcast.net [mailto:jude.taylor@comcast.net]
Sent: 15 Ağustos 2005 Pazartesi 21:32
To: alt-photo-process-l@sask.usask.ca
Subject: acid pre-soak

Regarding the earlier post suggesting acids and their respective
concentrations for pre-soaking paper for cyanotype and other processes,
acetic acid wasn't mentioned. Is acetic acid in the form of white vinegar -
grocery store brand - as effective as citric acid for a pre-soak? I have
been using diluted white vinegar (10 mls / 2 L diH20) as a dunk before the
tap water rinse...and the tray is blue-stained forever...so would prefer to
used this as I have plenty on hand.

What I plan to pre-soak is a small supply of printmaking and other fine art
papers that have moved around the country with me during the past 20 years.
I think it is about time to use them (smiles), but am no longer sure if they
are buffered, sized, etc. or even where I purchased them, except for the
Twinrocker handmades that I purchased "on site" when I lived in
Indianapolis, which shouldn't need soaking. A couple pieces are Winsor
Newton, probably watercolor papers.

Thanks!
Judy
Received on Mon Aug 15 13:00:52 2005