This is a very old thread, but one of the first results that comes up in google.
I believe I am experiencing the same issue in the UK. During normal damp weather I calibrated my cyanotype process and was able to achieve an exposure time of 8 minutes using a 1% Acid Bath for developer. In the...
I wonder if anyone could help, I'm also struggling with the Cuprotype process. I started out making some last week, and the first batch, following the recipe found here https://www.alternativephotography.com/cuprotype-process/
The first time I mixed the chemistry I was a little haphazard and...
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