Figure 3
From: Easier detection of invertebrate "identification-key characters" with light of different wavelengths
Different light colours may provide additional identification-markers though the induction of fluorescent patterns. Left panel. Line drawing of a scale from Harmothoe impar (Johnston, 1839). Right panel. Superposition of UV light and deep-blue light exposure of a scale of Harmothoe impar. Note, the blue and green fluorescence that is induced, and the composite form of the "spots" which is invisible with "white light".