[Alt-photo] Outgassing in contact-printing siderotypes

Darkrooms, Department of Art darkroommanager at cornell.edu
Mon May 19 12:56:09 UTC 2014


Thank you for sharing this information.  I am curious, Does the outgassing
create localized or global loss of sharpness?  Would you be able to share
an example print?

Thank you,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
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Ithaca, NY 14853

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On 5/19/14 8:05 AM, "Mike Ware" <mike at mikeware.co.uk> wrote:

>Hello Kees,
>Thanks for that added experience with polymer substrates, where the
>problem may be even more acute.
>It may be worth masking all non-image areas to minimise the gas emission.
>Good-bye brushmarks!
>I hadn't thought about Halvor's Chiba process, but his ammonium ferric
>citrate sensitizer will certainly evolve CO2.
>The photolysis of diazidostilbene, on the other hand, very likely evolves
>nitrogen gas.
>On 19 May 2014, at 12:12, Kees Brandenburg wrote:
>> Hello Mike,
>> I can confirm this. When printing ferric carbon, with Halvor
>>Bjørngård's Chibatype , I am using yupo as coating subtrate for the
>>pigment tissue. Yupo will not let the carbon-dioxide escape through the
>>back of the tissue.
>Alt-photo-process-list | altphotolist.org

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