Neutralization is a very important step that removes the residual acidity of pickling and provides an anionic charge to the leather. Removing acidity avoids the risk of slow hydrolysis of the protein and subsequent loss of strength. Anionization ensures a good penetration of the products used subsequently. Retanning essentially provides proper filling and compactness to each specific item type, plus special features such as different touches, good buffing-embossing properties, etc.

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