Restoring the water of salted stock is a process that has traditionally involved surfactants with varying degrees of biodegradability. Proteases with an optimum pH of around 9-10 are now widely used to clean the stock and facilitate the water uptake of the hide or skin. These enzymes break down soluble proteins inside the matrix, thus improving the removal of salt and hyaluronic acid. This makes room for the water. Using lipases together with proteases gives better action.

Process conditions: Adjust the pH to 9.5 with sodium carbonate. Leave to soak for 4-6 hours or overnight. Non-ionic biodegradable tensides can be used.

Since efficient soaking is extremely important for garment leather, PROPHEN SG is recommended.