To begin with we must know the material used in the preparation, Slaked
lime (calcium carbonate). Indeed the definition of parchment is a skin
treated with slaked lime which is dried in a stretched way.
How parchment was prepared before mediaeval times is uncertain. It is
thought that salt and flour made acid in water was used but there is also
the probability that chicken excrement was used.
Parchment is soft to touch, and the difference between the internal side
and the external side can be noticed. On some examples of parchment, traces
of animal hair are even left behind
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Art London Aristotle Antioch