The given diagram illustrates different steps in the process of producing leathers. Overall, the process involves two main stages, beginning with collecting animal skins and ending with waxing
In terms of preparation, initially, animal skins are gathered and transported from farms, which then are categorized based on their sizes. Following that, the sorted skins undergo a trimming process to eliminate unwanted sections. Finally, salt is incorporated into the cleaned hides to preserve them for extended periods.
Regarding processing, the first step is when the salted hides experience a curing process on racks for 30 days before being soaked in water for a period of 12 to 24 hours to soften. Subsequently, remaining hair in the softened hides is removed by knife to ensure a smooth surface. Afterwards, the cleaned skins undergo a pickling process where salt and acid are mixed in these hides to prepare for a tanning process. In this process, the hides are treated with chemicals for 2 days before being coloured and softened to create a desirable shade and improve softness. Following that, oil is added in the coloured and softened skins to prepare for the drying process. Ultimately, the dried hides are waxed by hand to ensure a smooth surface.