“Breathing”  and     Aeration    Wines   can
sometimes   be  improved    just    before  serving by
a    period  of  aeration    or  “breathing.”    Such    a
treatment    allows  volatile    substances  in  the
wine     to  escape  into    the     air,    and     it  allows
oxygen  from    the air to  enter   the wine,   where   it
reacts  with    volatile    and other   molecules   and
changes  the     wine’s  aroma.  No  significant
aeration     occurs  when    a   wine    is  simply
uncorked    and left    to  sit in  the open    bottle. The
most    effective   way to  aerate  a   wine    is  to  pour
it,  and     into    a   broad,  shallow     decanter    that
continues   to  expose  a   large   surface area    to  the
air.    Aeration    can improve a   wine’s  aroma   by
accelerating    the escape  of  some    off-odors   (for
example,    excess  sulfur  dioxide in  some    white
wines), and by  providing   a   kind    of  accelerated
aging   to  young,  undeveloped red wines.  But it
allows  desirable   aromas  to  escape  as  well,   and
can undo    the complexity  of  a   mature  wine    that
has developed   slowly  over    years   in  the bottle.
Wine    also    absorbs oxygen  when    it’s
                    
                      barry
                      (Barry)
                      
                    
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