RE: VDB

Michael,

1.5 DMAX with 1 coat? Frankly I'm a little skeptical of that value,
especially with Stonehenge (or most any other paper for that mater.) Could
it be that your densitometer is out of calibration?

Don Bryant

-----Original Message-----
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
Sent: Thursday, October 13, 2005 10:20 AM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: VDB

I get densities around the 1.50 +/- (5-stops) by single coating VDB. This is
to matte Stonehenge paper, no sizing. I find this is DMAX enough. How high
could one expect densities to reach with VDB? 1.8!? Higher?! Surely paper is
a big factor?

~m

----- Original Message -----
From: "Fabiano Busdraghi" <fabusdr@yahoo.it>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, October 13, 2005 3:38 AM
Subject: RE: VDB

> I always double coat VDB, bur a friend of mine reports that mixing a+b
with c
> just before coating, you can use only one coat. I never tried.
> ciao
> f
>
> > Loris,
> >
> > When I did VDB (I now prefer Kallitype, more steps but much more
flexible,
> > good contrast control is possible) I also double coated to obtain
> > acceptable Dmax,
> >
> > Best,
> >
> > Cor
> >
> > > -----Original Message-----
> > > From: Loris Medici [mailto:loris_medici@mynet.com]
> > > Sent: donderdag 13 oktober 2005 9:59
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: RE: VDB
> > >
> > >
> > > Add me to the list. I usually filter the Vandyke solution (using paper
> > > coffee filter) the day after mixing it. Even doing so, the emulsion
> > > shows further precipitation later (1 week after mixing, about
> > > 1/4 amount
> > > compared to the first precipitation). I filter it too. Much
> > > later, when
> > > silver plating occurs inside the bottle, I throw away the old emulsion
> > > and mix new sensitizer.
> > >
> > > BTW, I never managed to reach good Dmax with Vandyke by just
> > > one coat. I
> > > always double coat it. What is your experience? Do you get good Dmax
> > > with one layer Vandyke? If so, I will start to think I'm
> > > doing something
> > > wrong mixing it (I use directions given in Wynn White's article @
> > > unblinkingeye.com) - or my concept for good Dmax is a little bir
> > > exaggerated...
> > >
> > > Regards,
> > > Loris.
> > >
> > > -----Original Message-----
> > > From: Fabiano Busdraghi [mailto:fabusdr@yahoo.it]
> > > Sent: 13 Ekim 2005 Perþembe 10:43
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: Re: VDB
> > >
> > >
> > > hi,
> > > I also use the liquid on top. Mixing the solution just before
> > > coating I
> > > had a grainy and uneven result.
> > > ciao
> > > fabiano
> > >
> > > --- "Weber, Scott" <sweber@mail.barry.edu> ha scritto:
> > >
> > > > Thanks for all of the replies, I think I isolated the
> > > problem. I was
> > > > storing the coated paper under plastic containers that were
> > > not light
> > > > tight. The paper was exposed to small doses of florescent light for
> > > > several hours. I do
> > > > have another question about the precipitate that forms in the
> > > solution.
> > > > Should I mix that into a suspension before coating or is it best to
> > > let it
> > > > settle and just use the liquid on top?
> > > > Thanks,
> > > >
> > > > Scott B. Weber
> > > > Associate Professor of Photography
> > > > Department of Fine Arts
> > > > Barry University
> > > > 11300 NE 2nd Avenue
> > > > Miami Shores, Florida 33161
> > > > (305) 899 4922
> > > >
> > > > -----Original Message-----
> > > > From: RHobbs3@aol.com [mailto:RHobbs3@aol.com]
> > > > Sent: Tuesday, October 11, 2005 8:26 PM
> > > > To: alt-photo-process-l@sask.usask.ca
> > > > Subject: Re: (no subject)
> > > >
> > > > I have used very old VDB solution succesfully, although
> > > little flakes
> > > > of silver seem to precipitate out of the solution.
> > > >
> > > > Rob
> > > >
> > > >
> > > >
> > > > The information transmitted is intended only for the person
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> > > >
> > >
> > >
> > > HOME PAGE: http://fabiano.agriturismo-diavolino.com
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> > >
> > >
> > >
> > >
> > >
> > >
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Received on Thu Oct 13 10:16:28 2005