BERGGER PMK review
by David Tatnall
Pyrogallol (Pyro) was one of the first developing agents created and was popular in the 19th century. However, despite the outstanding negative quality that traditional pyro produced, it was regarded as problematic to use and lost favour as a standard developer when easier to use developing agents were discovered. It regained popularity with fine art and alternative photography practitioners in the 20th century when photographers such as Edward Weston began using it.