Alternative process
The term alternative process refers to any non-silver based photographic printing process. Currently the standard photographic printing process is the gelatin-silver process.
Alternative processes are often called historical, or non-silver processes. Most of these processes were invented over 100 years ago and were used by early photographers.
Many contemporary photographers are revisiting alternative processes and applying new technologies (the Digital negative) and practices to these techniques.
See also: Photographic processes