Usually red and purple bars drop the green resources connected to their faction, while elites and named enemies drop the blue resources connected to their faction.Originally Posted by Infl3encer2020 Go to original post
Farming Rikers and Cleaners is maybe a little bit more efficient, as they can drop all three blue and all three green materials. But they will never drop a material, if you're maxed out on it in your inventory – in such a case they would drop another material of the same color which you can still pick up.