They receive the bark in big sacks and extract the tannins by cooking it. The horsehides are put into certain frames that move around constantly. This ensures that the tannins don’t settle and the hides are evenly tanned. They also on a regular basis to ensure the solutions has the right consistency.
After thirty days, the horsehides are taken out of the solution and then shaved to expose the shell. Subsequently, it is put into another pit with a stronger solutions and tanned for another 30 days.
The two stages with different tannin concentrations are important because otherwise only the outside skin fibers would be penetrated by the tannins, while the inside would be still raw.
Overall, the leather is tanned in two separate pits for a total of 60 days. However, it takes an additional 4 months to create shell cordovan. After the tanning process, the leather is treated in different steps, polished.
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