[alt-photo] Re: cyanotype

[Loris Medici]

BTW, remember FAC is incredibly hygroscopic and deliquescent,
therefore it's pretty normal that the paper doesn't want to get dry in
very humid environment.

Regards,
Loris.


2010/6/2 Loris Medici <mail at loris.medici.name>:
> Christina that's my standard practice with cyanotype. I always expose
> hot air force dried paper (after paper absorbed the sensitizer
> completely that is - usually takes not more than 4-5 minutes...) for
> sake of consistency. That way my exposure times and contrast remain
> constant in all seasons / environmental conditions...
>
> Humidity increases sensitivity a lot and maybe that is causing the
> chemical fogging (my interpretation) which doesn't kick in when you're
> under a specific sensitivity threshold (with thoroughly force dried
> paper)... ???
>
> Regards,
> Loris.
>
>
> 2010/6/2 Christina Anderson <zphoto at montana.net>:
>> ...
>> We've taken to blow drying the paper with blow dryers til "snappy" to alleviate it.
>> ...
>