George wrote:
>
> But that doesn't give any usable information because it is just
> a vague request for quote. We have absolutely no idea what
> context "odorless" is used in because no specification is cited.

Quoting from U.S. Patent 6,610,343:

http://patft.uspto.gov/netacgi/nph-P...S=PN/6,610,343

"Most preferably, the solvent is a category I solvent
approved by The Council of the European Committees
(Jun. 13, 1988 Council Directive) for use in food
processing. Food grade propanes and butanes generally
meet all of the above stated preferences."

I don't know what's in the Council Directive,
or whether it spells out the requirements
for a food-grade propane or butane.