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Cr₄(SO₄)₅(OH)₂ 

Basic Chromium Sulfate (Cr₄(SO₄)₅(OH)₂) is an inorganic chromium(III) compound widely used in industrial and laboratory applications. It typically appears as a green crystalline powder or granules that dissolve in water to form green solutions. The compound contains trivalent chromium (Cr³⁺), which forms stable complexes with organic materials.

The most important application of basic chromium sulfate is in the leather tanning industry, where it is used as a tanning agent to convert raw animal hides into durable leather. During the tanning process, chromium ions bind to collagen fibers in the hide, improving the leather’s strength, flexibility, resistance to heat, and resistance to microbial degradation.

In addition to leather processing, basic chromium sulfate may also be used in textile dyeing, pigments, catalysts, and various chemical processes where chromium(III) compounds are required.

Because of its stability and effectiveness in complex formation, basic chromium sulfate remains one of the most important chromium compounds used in industrial chemistry.

In the ceramics industry,

chromium compounds derived from basic chromium sulfate can be used as a dark green pigment for ceramic glazes and colored ceramic materials. When fired at high temperatures, chromium compounds form stable green oxides that provide deep green coloration and good thermal stability in ceramic coatings and decorative finishes.

In addition, basic chromium sulfate may be used in textile dyeing, pigments, catalysts, and various chemical processes where chromium(III) compounds are required. Because of its stability and strong complex-forming properties, it remains an important material in several industrial processes.

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Formula: _{Cr₄(SO₄)₅(OH)₂}

Molecular Weight: 722.3 g/mol
Form: dark green powder
CAS Number: 39380-78-4
EC Number: 254-365-2
Density: 2.7 g/cm³