PHOTOCHEM Sodium Sulphide per 1kg (05511-1000)

Sodium sulphide (chemical formula: Na₂S) is a yellowish, water-soluble salt with a strong, unpleasant odor similar to rotten eggs due to hydrogen sulfide release. It is commonly used in tanneries, chemical manufacturing, and photographic processes.

In photography, sodium sulphide is primarily used in toning, particularly in sepia toning of black-and-white prints. After bleaching a developed silver image, sodium sulphide is applied to convert the silver halide back into brown-colored silver sulfide, giving the image a characteristic warm sepia tone.

This process not only changes the aesthetic appearance of the print but also increases its archival permanence, as silver sulfide is more stable and resistant to environmental degradation than metallic silver. Sodium sulphide is valued for producing rich, deep tones—but must be handled with care due to its strong odor and reactivity.

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