Wolfgang Moersch is a German printer, more than photographer. Through the years he has developed (pun not intended) his own range of chemicals and processes. These are now marketed.
He also runs workshops on all elements of printing.
There is quite a lot of information and examples on the website, http://www.moersch-photochemie.de/index_e.htm. The English version is unfortunately less complete than the original German, as well as suffering from some translation artefacts...
Nevertheless, worth a visit - particularly if you read German (click on the German flag).
I have been thinking about testing some of their chemicals. THe only place I have found that sells them on this side of the "pond" is in Canada.
Certainly interesting options espescially when toning for a shift in color.
Well J and C photo have promised, on their website, to start to handle the products sometime in the future.