>Thymol crystals are placed in an old honey jar lid placed on the queen
excluder directly over the brood; an eke is used to provide the necessary
air circulation.

Thanks Peter.  In California, we must treat at substantially higher
temperatures, and can experience serious brood kill in some colonies with
only 6 g.

Could you please elaborate on the type of hive configuration that you are
referring to?  Is there typically a honey band above the brood, but below
the thymol?
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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