Garth wrote
 
> Wood - go to your local saw mill and ask them if you can have
> untreated wood - this is better - then treat by painting your
> starting hive bodies with PCP wood preservative. Paint the inside
> with PVC paint, and the outside with enamel.
 
There is research published in the USA that points to PCP, when used to treat bee boxes, being able to leave a residue in honey.  I had used pentachlorophenol (PCP) over 20 years ago but stopped when I read the research and also the PCP would not allow the paint to stick properly to the outside of the box.  I was using both enamel and oil based paints.
 
Trevor Weatherhead
AUSTRALIA