The one pesticide analysis that I've seen of beeswax foundation "from the
good old days" was loaded with nasty pesticides and chemicals that have had
their registrations revoked.

DDT. DDE, DDD residues continued to show up in our wax samples until about 2010.  That's a long-time after the ban in the USA.  The chlorinated pesticides can remain in wax for years, maybe decades.  The newer replacements generally have short residue times.  However, there is evidence of some soil buildup of some of the neonics in fields that are repeatedly used.  From my own work, soil dust exposures may not be limited to planting times.  Bees are fuzzy, electrostatically charged, flying dust mops - nature's version of a swiffer pad.   The National Research Council years ago recognized that bees were excellent monitors of airborne chemicals, and I've published with Bruce Lighthart papers on scavanging of biologicals, including viruses and even anthrax and human stds (near a microbiology laboratory).

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