Klaf is a special type of parchment used in Jewish religious practices, particularly for writing sacred texts. It is made from the skin of kosher animals, such as cows or goats, and is prepared in a specific way to ensure it meets the requirements for use in Torah scrolls, mezuzahs, and tefillin. The writing on klaf is done with black ink and must be performed by a skilled scribe known as a sofer. The preparation of klaf involves several steps, including soaking, scraping, and stretching the animal skin. Once prepared, the klaf is treated to create a smooth surface for writing. This meticulous process ensures that the klaf is suitable for inscribing important religious texts, which are central to Jewish faith and practice.