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I have some old frames with old comb that may be 4-7 years old, it was in use up until last year. There is a lot of propolis glued all over the frames as well.

My two questions:

Does propolis lose it's potency (in terms of making holistic tinctures or just eating bits of it) after a certain time- does anyone know?

And has anyone ever tested propolis for possible pesticide accumulation the way they've been testing the wax in hives?

Any insights into this would be kindly appreciated.
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