The Wet Plate Collodion process was invented by Frederick Scott Archer in the mid 19th century. It replaced Calotypes and Daguerrotypes as it enabled much shorter exposure times. However, the process needed to be completed within a relatively quick timeframe. There was about 20 minutes from pouring the collodion onto the plate, making it light sensitive in a silver nitrate bath to making the exposure before dashing into the darkroom and developing the plate in Ferrous Sulphate.
This was shown to me during a recent workshop by Monika Fabijansczyk in the Gallery of Photography, Dublin. The video is a very brief overview of how it all works and it has inspired me to order my first set of chemicals and plates to experiment with this wonderful process and will be showcasing some of the work in the future when I begin to get good results.