Reducing the density of prints in a Farmers solution is a well known practice, sometimes used locally, to achieve sparkling white tones in highlights. Are such practices safe from the point of view of photographs permanence? Probably it depends on a particular photographic paper. Below is one example. The prints were made in 1978 on some kind of Ilford RC, matte, paper available then. The portion on the right was reduced in Farmers reducer, the part on the left was not. Obviously the process is not archival as evidenced by stains developed over time. Similar stains developed locally on other Ilford prints, subjected to localized reduction about the same time. It is not often I am using Farmers solutions, but I do not find stains on any other photographs in my archive. Majority of my prints are on fiber papers of various origins, and either they are neutral to the process of reduction, or I do not have prints which were reduced.(I do not keep written records on this process). Any comments, please.