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
>
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>
>
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>
Received on Thu Feb 16 12:05:47 2006