Slip is clay mixed with water to become a thick, smooth liquid that has the consistency require for your work and should be sieved, using a mesh of 80.
a) Slip for molding: Clay slip is used to fill up molds to be cast and fired. When fired they can be decorated using different methods. In the following two section two different ways of casting are very well explained; Read more about: Casting –A Fish / Casting – Dragon
b) As there are different colored clays, the main ones used are red and white and slip colors are clay mixed with products to form the colors and textures you require. You make the object you want to decorate jars, plates, bowls, etc. and when the clay is dry it is decorated with slips which should be prepared with the same type of clay as the piece that is going to be decorated. They can de decorated using different method such as spraying, pouring, brushing, spotting, trailing, dipping and sgraffito. Work formed in clay and decorated with slips, are always fired together.
c) Slip is also used a glue to join pieces of dry clay that are broken and to attach parts such as handles and knobs that have to be leather hard before being joined. In English this has another name it is called slurry, in most other languages they use the same word for all three.