The Pantone system is more and more talking about him, the webmasters (Jean and Bernadette Soares that we welcome by the way) site Quanthomme (on which I discovered the process myself before carrying out my engineer project above) set the record straight:
http://quanthomme.free.fr/nouvelles2004/nouvelle03072004.html

ps: we always advise our visitors to avoid training courses at unfair prices (> 100 €) organized on the system, you will find much more information on this site or the quanthomme site ...