Fig 4.

Examples of bacterial colonies belonging to different structural color categories. Observations were processed on epi- and transillumination. Iridescence categories are rainbow-diffuse (D), consisting of diffuse colors of the light spectrum; rainbow-edge (E), consisting of shining light spectrum color only on edges; metallic (M), consisting of silvery luster; and glitter-like (G), consisting of iridescent green in the middle and red and violet on the colony edges. Culture conditions are informed in Table S1 in the supplemental material.