I used Thymol in 1998/99; 10 grams Thymol crystals like the Bee Institute
of the University of Hohenheim made tests with years before.
I had a good result too but problems with my honey.

Alfred


Conclusions
· After the whole-year treatment of the colonies with the thymol
frame some honey samples show thymol residues in the area of the tolerance
value of 0.8mg/kg or above. The possibility that the taste of the honey may
be changed cannot be ignored.
· Presumably the removal of the frame during the honey flow can
decrease the thymol residues but the success of the treatment might be
reduced and be no longer sufficient.
· Because of the concerns regarding honey quality, the use of the
thymol frame cannot yet be recommended for practical application.

 http://www.beekeeping.com/articles/us/thymol.htm

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