Calo III calotype

Calo III was a meeting of folks who make calotypes in Oslo, Norway.

On this day we visited the Preus National Museum of Photography in Horten. The museum is located at an old naval facility, also home to the maritime museum for the Norwegian Navy, which is why we are posed on a submarine! The Preus museum was wonderful, and we were privileged to view their copy of The Pencil of Nature as well as a fabulous collection of calotypes and salted paper prints. We received a gracious welcome, and had a very memorable day.

Trutat variant of Pélegry calotype process.
5x7 Eastman No. 1, modified velostigmat
Mostly sunny and bright.
LV ~15, f/5.6, 2 minutes

Development:
No visible image at start. 1.4g gallic acid in 200 ml DH2O. I've stopped using the strong Greenlaw ANS for these and started adding AgNO3 and citric acid separately. I think it provides a little more control and flexibity. I added 5 drops of 24% AgNO3 and 2 drops of 12% CA. Image came up slowly, stopped at 1hr, 5min.

Wash 2x10 min., fix 2 x 10 min in plain hypo ( no Na carbonate, and no darkening ), 3 min. in 1% Na sulfite and then 2 x 10 min wash, with a few drops of 20% citric acid added to each change of wash water. The blister problem is not completely solved, but I think they are smaller and less of a problem if the wash water is slightly acidic.