Gleason Overlook calotype

2 December 2025 around noon

Maybe not a great calotype but this is my first Furlong family calotype that did not fog in the developer, and I kind of like it. Canson Marker and Ruscombe Chateau Vellum fogged badly both untreated and acidified in 2% sulfamic acid. This time I soaked in 10% NH4Cl ( to hopefully “chlorinate” any cationic starch ) washed and then acidified in 5% distilled vinegar ( calcium acetate is soluble. ) I saw that Darran Green over at FB does not wash after acidification, so I didn’t either. I have a sheet of iodized chateau vellum prepared the same way that I’m hoping to try tomorrow.

Not sure whose process I should say this is. I made a list of 12 historical sensitizers used with double iodide, with AgNO3 from ranging from 0.1 to 1%, acetic acid from 0.2 to 9% and ss gallic acid from none to 8%. Possibly if we leave out the gallic acid we should call it Adamson’s process. In any case it’s Furlong’s “single wash” iodizing process!

5x7 Eastman No. 1, velostigmat
White water LV 16, sky 15+, water 15, sun on near rock 14 , shade on rock 13.
16m @ F/22, extended to 20 minutes because fog and clouds obscured the sun.

iodized – single wash double iodide, washed overnight, dried for a day.
Sensitized: 0.71% AgNO3 and 2.85% acetic acid
the big stain in upper left appeared during sensitization.
Sensitized 11AM, exposed noon, developed 1:30PM

No image at start. Added ½ eyedropper ANS to 100ml ss gallic acid. Seemed to come up nicely. This one was very fun to watch develop… it was like watching a painting with ivory black watercolor. Done at 21 minutes. There were AgNO3 splatter stains on the back that disappeared in the hypo.