[alt-photo] Re: ware cyanotype paper sensitivity

[sam wang]

Chris,

Have you not gotten "purple fog" with the "cyanotype classic"? I have,  
and attribute it to paper not thoroughly dry when exposed. Or have you  
come across a new bug?

The pre-coated paper and cloth I received years ago from Blue  
Printables all had quite severe blue/green colors but as you said, all  
exposed and developed with no problem.

Sam
PS: is it as cold and dry in Montana as it is in SC? Not easy to do  
any alt printing!


On Jan 10, 2010, at 12:19 AM, Christina Anderson wrote:

> Earl,
> Did you expose it?  I expose paper that turns blue-green (Fabriano  
> Artistico does that to me regularly) and it works just fine. It may  
> be that it is duller and lower contrast, though.
>
> The problem with unsuitable paper and Ware's was that after exposure  
> and developing you will get a yukky purple fog in all the highlights  
> that really ruins the print.  But if you add citric acid to the  
> Wares coating mix that takes care of that.  1 or 2 drops of 40%  
> citric acid to 1 ml sensitizer or 1 g. citric acid to 100ml solution.
>
> But you won't know if you get yukky purple fog or dull/low contrast  
> blue until you expose and develop. At which point, use the citric.
>
> Let us know.
> Chris
>
> Christina Z. Anderson
> christinaZanderson.com
>
> On Jan 9, 2010, at 7:01 PM, Earl and Patty Johnson wrote:
>
>> I am new to this list, but I recognize almost all of your names  
>> from other places. I hope that some of you can shed some light on  
>> my situation.
>>
>> Today I coated some Mike Ware formula new cyanotype on Arches  
>> Aquarelle grain satine, and it turned bluish/green before it even  
>> dried. I know that this sensitizer is sensitive (pun intended) to  
>> paper chemistry, but I expected this paper to work. Does anyone  
>> have experience with this combination? Does the paper have an  
>> alkali buffer that can be neutralized with a soak in something like  
>> citric acid solution before coating? Or is my cyanotype solution  
>> bad and should be discarded? Or is this paper verboten for new  
>> cyanotype?
>>
>> I like the Ware formula - I get six or seven more steps in the  
>> Stouffer wedge than I do with the traditional formula. However, it  
>> is frustrating to coat it on expensive paper and see it fog  
>> spontaneously.
>>
>> Thanks for any comments.
>>
>> Earl Johnson
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