Science · Chemistry

What is the primary function of sodium thiosulfate in traditional film photography?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1To prevent spots by wiping dust chemically from negatives.
2To dissolve and remove unexposed silver bromide from the film.✓
3To whiten the background paper entirely.
4To blacken the exposed areas of the film image.

Correct answer

To dissolve and remove unexposed silver bromide from the film.

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