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>         The color reversion is the result of subsurface calcium hydroxide
> regenerating active hydroxide at the surface of the granule.  This alters
> the pH of the surface and, consequently, causes the indicator dye to revert
> back to white, even though the Sodasorb my be near exhaustion.

O.K., that's what I was basically saying - a redistribution of bound 
hydroxide such that the proportion of "active" binding sites at the 
surfae increases.  This is not true regenration, but does allow the 
particles to absorb more CO2 (because subsurface calcium hydroxide has 
time to help "carry the load").

>         Soda lime does not regenerate.  Instead, there has been a reversion
> of the indicator dye from purple to white.  Although there may be some
> additional carbon dioxide uptake due to the migration of these hydroxides,
> the absorptive capacity of soda lime, perviously saturated with co2, is
> minimal and should not be relied upon, even if the color of the granules has
> reverted back to white.

I would CERTAINLY agree with that part.

Aloha,
Rich

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