What does iridescence refer to?

Iridescence specifically refers to the phenomenon of displaying a range of colors that change when viewed from different angles, much like a soap bubble or peacock feather. This effect occurs due to constructive interference of light waves reflecting off multiple layers or surfaces, creating a spectrum of colors that shifts based on the angle of observation.

While generating light could relate to bioluminescent organisms, and transparency pertains to the ability to transmit light, neither fully captures the essence of iridescence. The characteristic of metals does not encompass the color-changing quality seen in iridescent surfaces. Therefore, the definition focusing on exhibiting rainbow-like colors accurately describes iridescence and reflects its unique visual properties.