It is basically clay mixed with water - thickness of maybe yoghurt but depends on the purpose and the personal preferance, it can vary. Slips are used as: adhesive: when you are putting a handle to make a mug, you will score both sides (making hatching lines with a fork or a needle) then put slip in between the handle and the mug to let them join. medium for stains: you can paint on your piece with something called "stains" Metcalf sells them in many many colours and you buy them in little zip lock bags. They are very cheap and you don't need a lot. You can mix the stain with slip to paint because the stains are powdered.
NOTE: All information contained within this article is pure opinion. Although this article is intended to help students, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.
RISDpedia and its contributers take NO responsibility for the information contained within.
RISDpedia is not an official site of the Rhode Island School of Design.