The so-called alternative processes in photography often refer to 19th-century techniques: the uniqueness of the print, its "stamp value" and the technical difficulty of these processes have been rediscovered by lovers of a slow pace and rare work. In addition, these ancient methods offer subtle tonal ranges, often very strongly linked to the sensitivity of the person carrying out the various stages of creation.
These processes, perfected by pictorialists in the 19th century in an attempt to push back against precision, still find fans today, and for the same reasons.