Juanse:

> That is why I do not think the browning is due to propolis but rather the
> cocoon or the heat of the brood or something done by the bees on the wax,
> from the inside or outside of the cell, but not from propolis.

Surely this is larval defaecation?
Best wishes 

Peter Edwards
beekeepers at stratford-upon-avon.freeserve.co.uk
www.stratford-upon-avon.freeserve.co.uk/ 

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