Twist Wet Plate Collodion process at 30 °C
A week ago the Fotopub Festival finished. I was a founder of the festival in 2001 and was running the show for seven years and today I’m proud to say that the level is so high I gladly enrol as a participant to one of the workshops. This year I enrolled in a workshop with Diana Lui and I was photographing river beaches in wet plate collodion. Heat is a nightmare for wet plate collodion process, but I rethought the process, made few tests and here we go, I was doing wet plate collodion process at 30°C almost business as usual at 20°C.
I’ve made several changes to the process.
1) I lowered the pH of silver nitrate bath from 4pH to 2.3pH by adding few drops of nitric acid into it (about 3 drops per 500ml should be enough, but check yourself)
2) I added more alcohol in my collodion mixture. I have alcohol on the spot and if I see it’s drying too fast I add some more solvent.
3) To my usual developer I added 25% of water and added 5 drops of nitric acid per 100ml of developer. I could add also 5gr of sugar per 100ml, but I didn’t have to.
4) when sensitizing plate in silver bath I reduced the time from 3 minutes to only 2 minutes. Mark Osterman is emphasizing that the sensibilization should be done by observation and not by time, but on the field I observe only the first plate then I do it by time. You can see when a plate is ready for exposure. If you leave it too long in the heat, you will get too much silver on your plate that will become fog during development.
5) I used water as my stop bath, but I’ve added a spoon of table salt to a liter of water. Salt will react with silver and will stop the development process immediately. It’s important to stop development fast if you work without running water and in the heat.
And that’s basically it. If the plate is perfectly exposed it should be developed for 20 seconds. I’ve learned this from Mark Osterman’s manual where he explains in details what does what in the process. I rethought and made lots of tests, wrote him a lot of questions and on the end I came up with results that are satisfying. Last but not least I owe Miša Keskenović lost of gratitude for all the knowledge he shared with me.
Have you seen my video about wet plate collodion at 0°C? HERE is the link. The same logic is behind, only fashion changes. When you understand the process you adjust the process freely to the conditions. Twist and shout the process out!
PS: This will be a supplement to my exhibition on 5.9.2013 in KKC, Dolenjske Toplice, Slovenia.
PPS: All those five steps aren’t probably necessary to deal with heat. Step number 1 makes about 60% of the effect I reckon, but with it you lose at least 2 f stops of sensibility of your wet plate collodion plate.