Hi all,

Its been very hot and humid for the last week or so where I live. I'm suddenly having problems coating a paper I regularly use (Arches Aquarelle) with the same chemistry (traditional 1A:1B) and the same coating process (hake brush). The paper is drying with severe streaks... severe enough that I would call the prepared sheets unusable. Is there a general guideline for humidity levels and the cyanotype process? I've seen humidity level recommendations for Pt/Pd but not cyanotype. Any suggestions would be greatly appreciated.