Joel,
>
> Alas, some of my honey super combs are partially plugged with . . . hardened
> white mass, and there is gray/black mould on some of the surfaces as well.
>
> Has anyone had luck with the bees removing this hardened material, or will
> they ignore it?  It is pretty hard to dig out.
>
 
In my experience they will often have to take the cells nearly down to
the midrib to get the stuff out, but they will eventually do it.
 
--
"Test everything.  Hold on to the good."  (1 Thessalonians 5:21)
 
Tom Elliott
Chugiak,  Alaska
U.S.A.
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