灰雾是感光材料的未曝光处在冲洗加工后所生成的密度。未曝光卤化银颗粒经显影生成的密度称为显影灰雾，冲洗加工中副反应生成的密度称为化学灰雾。由于空气氧化、过度显影以及偏离加工规范,都会使未感光的卤化银颗粒显影而产生灰雾。
那天早晨波莉离开家的时候，整个城市就已笼罩在一片灰雾中了。
When Polly left home that morning, the city was already covered in a grey mist.
浓浓的灰雾顺着河水漂移，笼罩着密集又门窗紧闭的建筑和污秽的泥路。
The thick pearl-grey mist drifting off the river hung over the shuttered, close-packed buildings and the muddy, mucky lanes.
分析了彩色正片的感光度、灰雾度和灰差度等特性；
This article analyzes such Characteristics as sensitivity, fog density and contrast of the colour positive.
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