Wet-collodion process is also called collodion process. The process involves adding a
soluble iodide to a solution of collodion (cellulose nitrate) and coating a glass plate
with the mixture. In the darkroom the plate gets immersed in a solution of silver nitrate
to form silver iodide. The plate, still wet, then gets exposed in the camera. Finally, it is
developed by pouring a solution of pyrogallic acid or ferrous sulfate over it and fixed.