So this type of atmosphere would be completely cloudy (and opaque to visible light) until the later (oxygen -producing) plants arrived, right?
Where then, in the global time frame, would these first theorectical "plants/microbes/amino-acid-strings" be compared to the formation of the moon from its asteroid collision?
(Moon is theorectically 4.5 billion years old. First rocks still existing in the Canadian shiled are also 4-5 billion years old. So when could the earliest "life" begin?)
I think the word you're looking for is "translucent." Opaque describes something that completely blocks light.