哪里吹牛？ 看看这个AI解释怎么做到的。

• Thin-Film Interference (Iridescence): When a thin film (like oil on water, soap bubbles, or a thin oxide layer on metal) has a thickness variation of just a few nanometers, it causes light waves to reflect and interfere with each other. This creates visible, shifting colors. A variation of only a few nanometers in thickness can change the perceived color from blue to yellow, for example.