What major technological shift separated the camera (the light-tight box) from the chemical darkroom?

Answer

Standardization of dry plates and flexible roll film

The standardization of dry plates and flexible roll film in the late 1800s, associated with systems like Kodak, finally allowed the physical camera apparatus to be separated from the necessary external chemical darkroom.

What major technological shift separated the camera (the light-tight box) from the chemical darkroom?
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