The making of parchment:

'Pour off the contents of the bath and repeat the process using the same quantities, placing the skins in the lime liquor, and moving them once each day over eight days as before.'

The skin, which is now laid with the hair side open, is ready to take new, fresh and stronger lime. The skill is in preparing the bath so that, depending on the skin sort and the temperature, as much as possible of the remaining substances can be freed from the skin, rather than the skin fibres.