hist-brewing: casks, outside of inside

[isenhour at uiuc.edu]

Jerry Harder typed:
 
 Perhaps I wasn't clear.  The charcol on the outside surface of the
inside of the barrel removes some toxins.
 
I was under the impression that you had to "activate" charcoal for
it to adsorb material.  How does it remove it, by selective de-activation
or adsorbtion of toxins? 

Just curious...
john

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