Re: Homemade POP ??

I was reviewing the Post-factory article. I have three questions.

1. What is the hydration of the citrate and citric acids? They are
available in different forms. One convenient thing about molarity notation.

2. As the formulae have multiple ingredients, is there a recommended final
pH? With complex mixtures, I find it a good double-check.

3. Has anyone tried using 0.1% azide in solutions as a preservative. It's
kind of nasty, but it really keeps the stuff from growing blue-green fur.

----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, September 21, 2004 7:13 PM
Subject: RE: Homemade POP ??

>
> On Wed, 22 Sep 2004, Liam Lawless wrote:
>
> >> I did an article on this subject in Post-Factory #5. Results resemble
> > commercial POP, but on art papers. I used only a small amount of
gelatin
> > for a low gloss. Prints are definitely more colourful than salt or
straight
> > SG. I haven't done any more work with it since PF #5, but I'm sure
there's
> > some scope to tweak the formula to get what you want.
>
> Hi Liam -- I wondered where you'd gone ! In fact I'd just looked up the
> article and was about to post the info myself. So as my contribution,
> here's the pull quote and first paragraph:
>
> Above the title: Why make your own printing-out paper? Besides the
> economy (more than a litre for the cost of 10 sheets of Centennial
> 12x16"), and the satisfaction of making it ourselves, is the lure of
> coating it on art papers. Liam Lawless has worked out the effective
> principles and the best formulaie -- and spiked the biggest problem.
>
> First paragraph: There are a few POP recipes in old texts, but I don't
> know of anyone who works with home-made POP, and only one person who's
> even tried. Nearly everyone thinks emulsion making is horribly complicated
> and requires great precision in weighing, timing, temperature, etc. My
> "innovation" is doing it as a two-part formula, so great precision isn't
> necessary, and neither is a ripening stage.
>
> The issue also includes 5 articles about cyanotype and one on John
> Dugdale and his cyanotype, among othertreasures. For info on obtaining,
> e-mail OFFLIST.
>
> Judy
>
Received on Tue Sep 21 21:56:31 2004