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Re: cyanotype failure to clear
> Is your workspace air conditioned? In hot weather cyanotype can fog
> rapidly before exposure.... does the emulsion start to look blue or anyway
> quite green when you put it under the negative? How long are you waiting
> from coating to exposure? If it's sitting more than 15 minutes in really
> hot humid environment, that could be the problem. Are you coating a bunch
> of papers & leaving them to sit?
None of this has changed much in the last month: I coat the night before,
store the coated paper in a box in the refrigerator, and remove it about
half an hour before starting to print. The emulsion looked ok before
printing. It was actually hotter and more humid about a month ago than it
> If everything above is negative -- are you washing the print face down,
> flipping it over from time to time? Has anything in the lighting
> conditions -- either over the sink or in the drying cabinet -- changed?
> Or maybe in summer the water coming in is warm enough to cause problems ?
I don't always wash the print face down, but I wasn't doing this before,
either, and never had a problem. Lights are the same. Water temperature
probably about the same. The only thing I can think of is that we had a
huge amount of rain recently, and a lot of sediment washed into creeks and
lakes, and I wonder if the ph of the water has changed perhaps? Would that
affect the clearing time?