[alt-photo] Re: cyanotype [Triangle]

[Trevor Cunningham]

Things keep coming back to North Carolina. Here in Saudi, I have NO 
issues with humidty, or benefit from it at that matter...unless you 
count prints drying indoors in less than an hour as a bonus. I'll be in 
Raleigh on the 11th. If anyone knows of something interesting alt-wise 
or photographic in general in the Triangle area over the next month, I'd 
love to know.

francis schanberger wrote:
> Chris,
>
> I always viewed the lavender as a nice surprise in botanical photograms done
> in cyanotype. The moisture trapped in the leaves often gives a surprise
> purple kick in the light midtones that I suspect is fugitive.
>
> After moving from the relatively dry climate of Southern California to Ohio,
> I viewed the 60% relative humidity as a bonus for working alt. What is the
> relative humidity at Penland and how are you dealing with, despite the high
> humidity, working in a "dry" county?
>
> -francis
>
> On Wed, Jun 2, 2010 at 11:58 AM, Loris Medici <mail at loris.medici.name>wrote:
>
>   
>> As for the "why?" I would suggest that you try to add a drop of 40%
>> citric acid into 10ml sensitizer and see if it gets better. If yes,
>> then it's probably chemical fogging (always more noticeable in the
>> highlights) due combination of increased sensitivity and paper
>> impurity (or sensitizer contamination?)...
>>
>> Regards,
>> Loris.
>>
>> P.S. Sorry for the "stuttering" postings...
>>
>>
>> 2010/6/2 Loris Medici <mail at loris.medici.name>:
>>     
>>> 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.
>>     
>>>>> ...
>>>>>           
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>>
>>     
>
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