The hive has been set up for around 3 weeks ago with a small swarm. They have been fed with a sugar and water mixture, also had a few problems with ants. Today on opening the have to check for brood and health, there appears to be some issues. I have attached a photo. My friend is new to beekeeping.
I’ve seen similar dark pollen before, trying to remember when. I have a feeling it was off scotch thistle or patterson’s curse. Others may be able to suggest a source based on what’s flowering in your area.