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staining in the center of a ziatype



Not just cyanotypes!
I am also doing ziatypes.  Although I get exasperated with the humidity 
requirements, I like the image when it's working!

I'm having a problem - sometimes - with staining in the 
highlights.  Generally, I get good clearing on the fringes of the image no 
matter what; sometimes I have problems clearing in the *center* of the 
image.  I suspect this is due to lack of humidity control.  Any suggestions?

My routine is currently:  humidify the paper for 20 seconds or so, 10 on 
each side.  Coat with equal parts afo, lith p generally 9 drops is what I 
need for the sheet, with a partial drop of tween and a partial drop of 
sodium tgs.  Dry fairly completely with fan in reduced light, this takes 
about 3 or 4 minutes.  Rehumidify about 20 seconds and expose as 
needed.  I'm clearing in citric acid.

The reason I like to dry to near complete-ness is because I ran into images 
that had blurry areas... I think caused by almost-damp areas.  I am not 
having this problem when I dry more thoroughly.  Also, I think this routine 
may be more repeatable in variable humidity conditions here in CO!

TIA
Kathryn