RE: NA OW? (RE: spectral sensitivity of platinum/palladium and cyanotype coatings.)

NaOW is Sodium Tungstate. it's purpuse is to lower contrast of the Ziatype
emulsion and warm the neutral black image color (LiPd alone gives neutral -
almost coldish black). I sometimes use 10 drops AFO + 10 drops LiPd + 3
drops NaOW - this gives a very warm image color and a pretty low contrast
emulsion (but very open shadows).

Regards,
Loris.

-----Original Message-----
From: Eric Neilsen [mailto:e.neilsen@worldnet.att.net]
Sent: 22 Şubat 2006 Çarşamba 01:26
To: alt-photo-process-l@sask.usask.ca
Subject: NA OW? (RE: spectral sensitivity of platinum/palladium and
cyanotype coatings.)

Loris, I am not familiar with NaOW. What is it and at what concentration are
you using it?

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter
> -----Original Message-----
> From: Loris Medici [mailto:mail@loris.medici.name]
> Sent: Tuesday, February 21, 2006 11:31 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: spectral sensitivity of platinum/palladium and cyanotype
> coatings.
>
>
> Interesting. I can print Ziatype emulsions - incorporating
> considerable amnt. of contrast lowering NaOW additive - which exhibit
> 30 steps with a 31-step tablet (read as: emulsion needs log 3.00
> density
> range!) using the
> PDN system and 1290 printer (1280 equivalent in Europe) easily.
> Of course I
> have to use the stongest color G255-B0 with this emulsion, but I can
> definitely print with good dmax and specular highlights that are paper
> white.
Received on Wed Feb 22 02:50:14 2006