for the correction of my treatment of the English language. As this paper should serve as an English summary, not all the pieces I will refer to will be shown in drawing and with complete description, but only the most common types. For a more thorough treatment cf. B. BADER, Tell el-Dab c a XIII, Typologie und Chronologie der Mergel C-Ton Keramik, Vienna 2001 (in the following quoted as B. BADER, TD XIII). Note that only a small part of the Marl C-material from Kom Rabi c a is represented there. The complete corpus will be published by J. Bourriau. 1 DO. ARNOLD, Ägyptische Mergeltone ("Wüstentone") und die Herkunft einer Mergeltonware des Mittleren Reiches aus der Gegend von Memphis, in: DO. ARNOLD (ed.), Studien zur altägyptischen Keramik, Mainz 1981, 7 The term "self slip" is used here in the following sense: a white layer on the surface of the vessel developed by itself in the course of production through the presence of soluble salts. But it does not mean a slip consisting of the same material as the vessel. Cf. BADER, TD XIII, 22, footnote 54. The white surface can also be used as an indicator whether a given sherd belonged to an open or closed vessel, because on closed vessels only the outside shows this surface colour whereas on open shapes the inside is also white. There are, of course, exceptions, that could be explained by placing vessels inside each other in the kiln or while drying. 8 F. R. MATSON, Technological Studies of Egyptian Pottery-Modern and Ancient, in: A. BISHAY (ed.), Collected Papers of the 2 nd Cairo Solid State Conference, 1973, Recent Advances in Technology of Materials,