[alt-photo] Re: Ziatype questions

[Vedos]

Thanks Loris,
OK, I'll dry the paper longer... another try tomorrow.

About the EDTA, I don't really know which variety... maybe I better forget about it and use sod. sulfite (or citric acid as you suggest).
The paper is Guarro Casas (from Spain), like it a lot... I made small tests today, used 8 + 8 drops for a 12x16 cm area.

- Jalo

-- If you only look at what is, you might never attain what could be --

V E D O S
Alternative Photographic Processes
Satakunta University of Applied Sciences
vedos at samk.fi
http://vedos.samk.fi
http://www.samk.fi
________________________________________
From: alt-photo-process-list-bounces at lists.altphotolist.org [alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of Loris Medici [mail at loris.medici.name]
Sent: Thursday, August 05, 2010 10:23 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Ziatype questions

  Jalo, just dry the paper a little longer. Let's say try drying the
paper for at least 30 minutes. 10-12 minutes at 72% RH is quite short; I
was drying my paper 15 minutes in winters, where room temp was 18-20C
and RH 30-40%, and still being able to get neutral results with good
dmax... If you see fibers stuck on the acetate your paper is definitely
too damp!

Also, are you sure that the paper is soaking the sensitizer enough? What
paper is that and how much coating solution per area are you using? (I
was using 0.25ml per 10 sq. in. ...)

Can't help with EDTA (which one BTW? Na2 or Na4?); mine (4-5 year in
shelf) still dissolves pretty quickly. A simple 2-5% citric acid bath
also will clear the print pretty effectively - at least it was with the
papers I was using... (COT320, Masa and Whatman Watercolor.)

Regards,
Loris.


05.08.2010 21:56, Vedos yazmış:
> Hi all, a wannabe ziatypist here, with questions :-)
>
> 1. My EDTA refuses to dissolve, is there a trick to dissolve it to water? I did some platinum printing long time ago (last prints from 12 - 15 years ago) and have got a stock of EDTA from that time... can it go bad? I don't remember having to do anything special to get it dissolved back then, but I googled some info about needing to raise the pH of the solution to 8 (with NaOH) to get it dissolved. Is that so?!
> Oh well, I then used sodium sulfite as a clearing bath, worked just fine.
>
> 2. My negatives keep sticking to the paper, although I let them dry for 10 to 12 minutes, and then dry for 2 minutes more with a hair dryer (cool setting). The paper feels quite dry after this, IMO. But maybe it's just the rH of my workroom (around 74 % today)... So, I started using a sheet of acetate between the paper and negative, but there's still a slight image transfer from the paper to the acetate happening... paper still too wet?
>
> OK, this has been my first day with zia, and I'm learning... ;-) ...more about my day here:
> http://vedos.samk.fi
>
> Cheers,
> Jalo
_______________________________________________
Alt-photo-process-list | http://altphotolist.org/listinfo