"Igor" wrote in message
oups.com...
How do you know when the H2S is gone?


Igor,
The human nose is very sensitive to hydrogen sulfide and it can detect about
20 parts per _billion_ (see Concepts in Wine Chemistry," page 320.
Your nose is more sensitive than many analytical interments costing hundreds
of thousands of dollars, so trust your nose. (If you can't smell it, it
ain't there.)
Good luck,
--
Lum
Del Mar, California, USA