Sodium vapor street lamps emit the characteristic sodium line.

钠蒸汽路灯发出特有的钠线。

Despite multiple attempts to replicate it, Vlahos could only create just one working prism which meant there was only one sodium vapor camera, in the entire world.

尽管多次尝试复制它，但 Vlahos 只能制造一个工作棱镜， 这意味着全世界只有一台钠蒸气相机。

To achieve the effect, the actors would stand in front of a white screen lit by a yellow hue from sodium vapor lights, hence its name, the sodium vapor process.

为了达到这种效果，演员们会站在白色屏幕前， 白色屏幕被钠蒸气灯的黄色调照亮， 钠蒸气过程因此得名。