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

It was more that I just forgot what the W was standing for and it didn't jog
anything in my mind. But it does bring up a point of being accurate with
weights and measure in formula. Is one to look for di hydrate when buying
Sodium Tungstate for working in the Zia system or is it anhydrous?

Surely one can work out a number of drops that will work either way but it
could change the percentage and make for erroneous observations.

Eric

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: Thursday, February 23, 2006 2:28 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: NA OW? (RE: spectral sensitivity of platinum/palladium and
> cyanotype coatings.)
>
> Well, in chemfinder.com it is "coded" as following: Na2O4W. Should be
> clear that it's Sodium Tungstate in either coding methods (since we're
> referring to it in the 'Ziatype printing' context).
>
> Regards,
> Loris.
>
> -----Original Message-----
> From: Eric Neilsen [mailto:e.neilsen@worldnet.att.net]
> Sent: 22 Şubat 2006 Çarşamba 21:29
> To: alt-photo-process-l@sask.usask.ca
> Subject: 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
Received on Fri Feb 24 08:58:33 2006