Chromium tanning is a method used to preserve animal hides and turn them into leather. This process involves soaking the hides in a solution containing chromium salts, which helps to stabilize the collagen fibers in the skin. As a result, the leather becomes more durable, flexible, and resistant to water and decay. The chromium tanning process is faster than traditional methods, often taking just a few days. It is widely used in the leather industry due to its efficiency and the quality of the final product. However, concerns about the environmental impact of chromium have led to increased scrutiny and the development of safer alternatives.