RE: Hardening salted paper and potassium dichromate

I see, I hadn't understood that from your first message ("std. printing
time = 10 mins, after 1 min. exposure all steps are white" is not the
same thing as what you're saying now, and also the statement "after
adding 0.2% AD, std. printing time = 2 mins." quite confused me). I hope
wou will be able to solve your problem with the "black + color inks"
negative, please inform us if that method works for you.

Regards,
Loris.

> -----Original Message-----
> From: Fabiano Busdraghi [mailto:fabusdr@yahoo.it]
> Sent: Monday, June 20, 2005 6:22 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Hardening salted paper and potassium dichromate
>
>
> because I'have tried it (I have tried to say it in my first
> message, but my english...), but after one minute all step of
> the colour palette are light brown, and I have to expose 9
> minute more to have dmax... no potassium dicromate simply
> does not work with my epson 2100 and standard inks on
> pictorico ohp. I'll try lower dichromate concentration, but
> some will be necessary. to increase contrast maybe I would
> have to change light, or other parameters.
> anyway thank you for you answer loris
> fabiano
>
> --- Loris Medici <loris_medici@mynet.com> ha scritto:
>
> >
> > Why don't you try first with the lowest contast emulsion
> mix (read as:
> > no potassium dichromate)? I haven't done salt prints before
> but AFAIK
> > adding contrast agents to the emulsion decreases the speed of it
> > considerably... What printer are you using? If it's an
> Epson with OEM
> > dye inks then the UV density of red dye should be more than
> enough for
> > making salted paper prints without the addition of contrast
> agent (was
> > it log 3.6?). Also, I remember reading somewhere that the Ammonium
> > salt is slightly more contrasty than the Sodium salt...
> >
> > Regards,
> > Loris.
> >
> > > -----Original Message-----
> > > From: Fabiano Busdraghi [mailto:fabusdr@yahoo.it]
> > > Sent: Monday, June 20, 2005 5:43 PM
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: Hardening salted paper and potassium dichromate
> > >
> > >
> > > Hi,
> > > after printing several traditional negatives on salted paper
> > > I tried pdn, that I had successfully experimented with
> > > multigrade fb paper. Usually I use a 2% NaCl and 1% gelatine
> > > solution and a 12% silver nitrate, 6% citric acid sensitizer.
> > > I brush coat both solutions. Paper is Rives bfk. Using my
> > > black light tubes my standard printing time is about 10
> > > minutes, but after 1 minutes any step of the colour density
> > > range palette is still white. Adding potassium dichromate
> > > (0.2%) to the salted solution I than have a standard
> > > printing time of about two minutes and still pure white steps
> > > (I'm searching the minimum amount of potassium dichromate to
> > > print whit pdn but this is another story).
> > > ...
> >
> >
>
>
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Received on Wed Jun 22 01:16:43 2005