Homebrew PCBs

Cupric chloride is also used as a pesticide in a mix with a penetrating oil
on wood posts that are buried in the ground. It keep the termites out of the
wood and acts as a preservative. They sell it already mixed allot of the
time but I am sure that you could buy the powder to mix your own. It doesn't
seem to hurt plants but it sure keeps the insects out of my posts.

Cheers
Bob in Tucson