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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!