Sefer Torah
Production
Written entirely in Hebrew, a Torah scroll contains 304,805 letters, all of which must be duplicated precisely by a trained scribe, or sofer, an effort which may take as long as approximately one and a half years. An error during transcription may render the Torah scroll pasul ("invalid"). According to the Talmud, all scrolls must also be written on gevil parchment that is treated with salt, flour and m'afatsim (a residue of wasp enzyme and tree bark) in order to be valid. Scrolls not processed in this way are considered invalid (Hilkoth Tefillin 1:8 & 1:14, Maimonides).
Sefer Torah-7