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In Living Color: Bacterial Pigments as an Untapped Resource in the Classroom and Beyond

Figure 2

Using the biopigment actinorhodin as a case study to understand the logic of color.

(A) When light strikes a pigment, electrons absorb energy and are transferred from the HOMO to LUMO; (B) Relationship between wavelength of visible light and its color; (C) The complementary relationship between color of the absorbed light and the perceived color; (D) Structure of actinorhodin; (E) Absorption spectrum of actinorhodin. The pigment absorbs light at 600 nm, and is therefore perceived as blue by the brain.

Figure 2