Here is more info on this stuff than you want to know:
 <http://www.vet.purdue.edu/depts/bms/courses/chmrx/cap.htm>
Note that it is illegal to use on food producing animals in the U.S.A.
Someone needs to start checking the imported honey coming in as it is well
known that some foreign packers are blending low cost Chinese honey with
their own to cut costs.This lets the Chinese evade the import restrictions
,as the barrels come in labeled product of Mexico,or where ever.You can be
absolutely sure that if chloramphenicol is in Chinese honey in the UK,its
here in the US.

--Mike