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

Looking it up it is written Na2WO4 . 2H2O

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter
> -----Original Message-----
> From: Eric Neilsen [mailto:e.neilsen@worldnet.att.net]
> Sent: Wednesday, February 22, 2006 1:11 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: NA OW? (RE: spectral sensitivity of
> platinum/palladium and cyanotype coatings.)
>
> I had another symbol in my mind for Tungsten. Thanks.
>
> Eric Neilsen Photography
> 4101 Commerce Street
> Suite 9
> Dallas, TX 75226
> http://e.neilsen.home.att.net
> http://ericneilsenphotography.com
>
> > -----Original Message-----
> > From: Loris Medici [mailto:mail@loris.medici.name]
> > Sent: Wednesday, February 22, 2006 2:50 AM
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: 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 13:29:37 2006