Basic chromium sulfate (BCS)

Basic chromium sulfate (BCS), also known as chromium(III) sulfate or chromium hydroxide sulfate, is a chemical compound with the formula Cr(OH)(SO4). It is derived from chromium ore and is widely used in the leather tanning industry as a tanning agent.

BCS is a greenish-blue solid that is sparingly soluble in water. It is typically produced by the reaction of sodium dichromate with sulfuric acid, followed by precipitation with sodium hydroxide or lime. The resulting compound is a mixture of chromium hydroxide and chromium sulfate.

In leather tanning, BCS plays a crucial role in the conversion of animal hides into leather. It acts as a tanning agent by forming stable complexes with the collagen fibers in the hide, which helps to preserve and stabilize the structure of the leather. BCS provides improved resistance to water, heat, and microbial degradation, resulting in durable and high-quality leather products.

It’s important to note that the use of chromium compounds, including basic chromium sulfate, in the leather industry has raised environmental concerns due to the potential toxicity of hexavalent chromium (Cr(VI)). Efforts have been made to develop and promote safer and more environmentally friendly alternatives in leather tanning processes.

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