Not that this is on point with the original topic of this thread, but most of the research regarding chemical contamination of wax in brood combs has focused on larval health, not human health.
I daresay, potential chemical contamination in wax in brood combs would kill a colony, or at least reduce it to a level where it is unable to produce a commercial honey crop, long before honey produced by that colony would be unfit for human consumption.
Concerns for human heath of chemical contamination in honey, if any, revolve more around the water soluble chemicals that may be present in nectar or sugar syrups, not minute quantities of fat soluble chemicals in wax in brood combs.
In other words, if one is going to rotate out 5 year old brood comb, it is out of concern for bee health, not human health.
With respect to the original point of this post, I don't know how many other's have looked at Jose Villa's reference from a few days ago, posted under "A look at queen, worker and larval behavior inside cells" (sorry to jump threads, moderators; this is starting to be messy). One would think if bees were removing cocoons, the authors of that study would have seen and made mention of it.
Tracey
Alberta, Canada
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