Re: Cyanotype

Tom

Yes I am in a hard water area. I have tried a vinegar pre-soak, but vinegar
development seems more effective with my water.

David
----- Original Message -----
From: "T.E. Andersen" <postlister@microscopica.com>
To: <alt-photo-process-L@usask.ca>
Sent: Thursday, February 16, 2006 6:05 PM
Subject: Re: Cyanotype

> Hello David and Loris,
>
> Are you sure these problems are not related to buffer (CaCO3) in the
> paper, or hard water? If you are using buffered paper, it may be an
> option to treat the paper in vinegar (or citric acid) prior to coating,
> followed by washing in soft water. That way, the acid would not be mixed
> with the other chemicals. (I have not tried it, but have thought about
> it as a way to get rid of buffer in paper).
>
> Best regards,
> Tom Einar
>
>
> David & Jan Harris wrote:
> > Possibly. It does flatten the contrast, which can be a benefit depending
on
> > what negative you are using. It certainly protects the highlights which
used
> > to disappear during drying before we started using vinegar. We solved
the
> > bleeding problem by leaving the coated paper to dry for about 1 hour
after
> > coating, actually this helped improve the dmax too. I've no idea why it
> > prevents the bleeding, but it does for us.
> >
> > David
> > ----- Original Message -----
> > From: "Loris Medici" <mail@loris.medici.name>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Thursday, February 16, 2006 3:30 PM
> > Subject: RE: Cyanotype
> >
> >
> > Slightly IME (white vinegar 1:3) and it has a very bad effect on
> > contrast (very flat prints) plus I experienced serious bleeding (blue
> > wash water) trying this. Perhaps our results vary due to the difference
> > between our water/paper/whatnot?
> >
> > Thanks anyway.
> > Regards,
> > Loris.
> >
> > -----Original Message-----
> > From: David & Jan Harris [mailto:david.j.harris2@ntlworld.com]
> > Sent: 16 Şubat 2006 Perşembe 17:10
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Re: Cyanotype
> >
> >
> > Loris
> >
> > Have you tried developing traditional cyanotype in vinegar solution? We
> > find it greatly increases dmax.
> >
> > David
> >
> >
> >
> >
> >
> >
> >
>
>
>
Received on Thu Feb 16 16:31:49 2006