Default type 0 and type 1 colors clash for the Red-green colorblind
The default two color types are green for type 0 and red for type 1. This means that if you have a 2-particletype simulation, and use the default settings, then the two types are indistinguishable to red-green color-blind people.
This can be easily worked around, but only if you think about colorblindness when making figures, which many people don't.