contaminated Wax

[Pond Creek Farm]

I have seen multiple references to the wax supply (in reference to commercially available wax foundation) being contaminated by chemicals.  I understand that homogonized wax from multiple sources can become contaminated, and I am presuming that foundationless beekeeping is a method for avoid this contamination.  What I do not understand is how this will prevent contamination?  How do I see to it that my wax is not contaminated?  I can see to it that I do not introduce any chemicals, but I cannot control the entire forage area of the bees.

[buzzbee]

You can keep chemicals like check mite and camaphous out of your hives and trading out old combs helps keep contamination levels reduced greatly.

[Michael Bush]

Foundation is contaminated.  If you don't use any and you don't add contaminates then the only source is what the bees bring back from the fields which should be minimal.