Final answer:
The subject of this question is Chemistry. The question asks about the time it takes for fresh, full-strength fixer to clear films. The collodion method introduced in 1851 allowed for a shorter exposure time of 3-5 minutes.
Step-by-step explanation:
The subject of this question is Chemistry.
The question asks about the amount of time it takes for fresh, full-strength fixer to clear films. In photography, a fixer is a chemical solution used to remove unexposed silver halide from photographic film or paper, making the image permanent and stopping further development. The answer choice that specifies the time required for fresh, full-strength fixer to clear films is the correct one.
Based on the provided information, the collodion method introduced in 1851 allowed for a shorter exposure time of 3-5 minutes, resulting in a clearer image.