How about a can of spray paint? Spray the aggressive bees, then later
see in which colonies you can find them, or their corpses.

[log in to unmask] wrote:

> Also, when I get to this yard and am still getting things ready, there are
> some aggressive bees that immediately show their displeasure with my being
> there.  The problem is I can't tell which colony they are from.  When I work
> the colonies none appear more aggressive than any other.