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Re: inorganic vs organic arsenic

Just a coupla hunches, and moreover hunches from an ex-Liberal Arts major who opted for Science Lite at every opportunity:
-- Decay isn't something that just happens to wood; it's a symptom of attack by microscopic life forms. Stopping it involves killing off those life forms by soaking the wood with substances that are poisonous to them -- and, coincidentally, to us.
-- To equate the toxins in CCA with any remotely analogous compound in shrimp seems like a pretty thin smokescreen. You could smear pine posts with seafood until your loved ones called the Home to come & get you, and I doubt you'd retard their decay by a nanosecond.

JF 
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