Alum Tawed Leathers are made by first salting the skins, then their are washed and limed to remove any remaining hair or grease. The skins are then neutralised and subjected to an enzyme process to remove any unwanted proteins between the fibres.
Next they acidified in the presence of a large quantity of salt that prevents any acid damage. Once stable, the acid pickle is drained and replaced with a combination of salt, potash Alum and oil which is drummed into the skin for two days. The skins are then hung to dry and piled to age for at least three weeks.