[Alt-photo] Ageing of New Cyanotype
john.isner at gmail.com
Tue Mar 27 18:37:35 UTC 2018
A few months ago (much less than a year!), I made my first batch of New
Cyanotype using the kit from Photographer's Formulary. I created a curve
following Ron Reeder's method on the Freestyle Photo web site. My prints
were very good -- until recently.
As the New Cyanotype aged, it went from a light green-yellow to a dark
blue-green. By the time I was getting close to the bottom of the bottle,
my curve was no longer linearizing properly. There was an almost complete
loss of tonal range in the shadows. I had to discard most of my prints.
I should mention that I was routinely overexposing my prints. I won't go
into the reason why, but I didn't think it was a factor because of what
Christopher James says in his book: "it's hard to overexpose cyanotype."
Here are my questions: (1) Even though New Cyanotype is supposed to have a
shelf life of one year, is it advisable to make a new curve periodically? (2)
Does overexposure become a problem as New Cyanotype ages?
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