Nonpurple

Photoheterotrophic bacteria are relatively rare and include members of the nonpurple sulfur bacteria; this group is relatively insignificant in the soil ecosystem.

Source: wiktionary

Say you only hire purple workers. If purple workers strongly prefer to work with one another instead of with other groups, why might you prefer to hire a less productive purple worker than a more productive nonpurple worker at the same wage?

Source: wiktionary