Those of located in old europe may be interested to here that there is a new staining/tanning developer on the market, Moersch Tanol.
Developing agents used are Hydrochinon, Pyrocatechin and Dimezone S.

Examples of the results can be viewed at:

If you want to get an impressions of the work Wolfgang Moersch is doing as a printer have a look at the "fine-print" section where he presents some of the work he has been doing for his clients.