(understood as the half-skin from the flesh side). Phylacteries, if written on k'laf, must be written on the flesh side. A mezuzah, when written on duchsustos, must be written on the hair side. It is unacceptable to write on k'laf on the hair side or on the split skin (either g'vil or duchsustos) on the flesh side.

Preparation

The legally required method of cleaning and preparing has been altered over the centuries. During Talmudic

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