Nathan,
I wasn't aware that there was a sauce thread here! Thanks, Chris, for taking such good care of Nathan.
I recently "unveiled" a new sauce portrait at the Painting Portraits From Life section.
http://forum.portraitartist.com/show...?threadid=1761
You can purchase sauce through Dick Blick -- although they handle the assorted sauce, while I work exclusively in black sauce (there is a black sauce stick in the assorted box). You would also need a pestle and mortar (to crush the sauce stick into a powder), tortillion, kneaded eraser, bristle brush, watercolor brush and wash brush, ink eraser, and a stick of vine charcoal.
Jack Richesen and Co. is the distributor of sauce. You can contact them about where to purchase it at
http://www.richesonart.com/bio.htm
The April/May 2002 issue of International Artists Magazine has my sauce article. It contains a step by step (the sauce drawing you posted, my son Paul, was the step by step in the article), history of sauce, and 19th century Russian artist Ivan Kramskoi.
If you have any additional questions, I would be happy to answer them.
I just think sauce is an incredible medium.
Peggy
(By the way, I have a sauce video I am in final edit on. It will be 120 minutes long, and sell for $59. Denise, posted in the From Life section, is the demo model. I also teach a 5 day charcoal/sauce workshop in La Crosse, WI during the summer. The dates this year are June 2-6, and the cost is $400)