PHOTOCHEM Potassium Alum per 1kg (05530-1000)

Potassium Alum (chemical formula: KAl(SO₄)₂·12H₂O) is a white, crystalline compound commonly used as a mordant, astringent, and stabilizer. It is a type of double sulfate salt containing potassium and aluminum.

In photography, potassium alum is traditionally used in alternative and historical printing processes, such as albumen and carbon printing. Its main role is as a hardening agent—it helps harden gelatin or albumen layers on photographic paper or film, making them more durable and less sensitive to physical damage or swelling during processing. This hardening improves image sharpness and stability, especially during washing and drying stages.

Potassium alum is valued for its ability to enhance the archival quality of prints and ensure consistent image quality in labor-intensive, hand-coated photographic methods.

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