Silver sulfide

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Silver sulfide (Ag2S) is an insoluble black compound of silver and sulfur. Commonly found as the black tarnish on silver objects. Naturally found as the mineral achantite.
Solubility in water is 12 mg/l.
Nitric acid turns silver sulfide into silver nitrate and silver sulfate.

Sources of silver sulfide

Silver sulfide is not that common. It is sold as a photosensitizer for photographic work.
For the refiner silver sulfide is mostly encountered as a step in recovering silver from photographic fixer.
Silver sulfide can be formed from most silver solutions by adding sodium sulfide.

Reduction back to silver

There exists several ways of converting silver sulfide back into metallic silver.

References

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