For a definition of graissier, see http://www.littre.org/definition/graissier

I found two possible translations for graissier:

grocer dealing in grease
From page 567 of the PDF at http://jsh.oxfordjournals.org/content/10/4/560.full.pdf :
"The medical jury's list for Strasbourg identified nine individuals, including two whose names are familiar: Kuchel, the hypnotist, who according to the report practiced medicine and distributed an "elixir"; and the Richert woman, "known by the name of La Dormeuse, or Barbe la Dormeuse." The others included an abbe; a weaver who treated external conditions and consumption; a graissier (grocer dealing in grease) who treated cancers; a shoemaker who practiced medicine "without being on any list"; and a self-styled officier de sante who had signed a spurious certificate."

grease monger
http://books.google.fr/books?id=Q6Q9pc27-NMC&pg=PA674&lpg=PA... :
"Henceforth, a baker was not just a baker, but also a grease monger and a mercer-grocer, who had duties and loyalties towards each of those guilds."
Also see http://scholar.google.com/scholar?q="grease monger

However, it seems that "grease monger" now has a slang meaning... (see http://slang.ie/index.php?county=all&entry=grease monger ). So perhaps a version using "grocer" would be better....


Master would be a recognized skill level. For example, see: http://www.worldthroughthelens.com/family-history/old-occupa...
"MASTER One of three grades of skill recognised by the Guild of Crafts"

or "merchant specialising in grease products" but that's rather long-winded.