This time I tried coating the solution twice, as advised by Carl. This seems to have done the trick. This image is from two years ago - the Mississippi River from Hidden Falls Park in St. Paul on a misty, rainy morning in May. The negative was developed in PMK pyro, and the subtleties of the scene are mostly visible in this blueprint. The paper is Fabriano Artistico. Classic cyanotype formula, brush coated twice. Exposed with the spiral BLB bulb for 2 hours, 30 minutes.
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