This post will detail the steps involved to mix up my black slip I use for all of my black & white sgraffito forms. It's fairly simple if you use a white clay body (preferably without grog to keep a smooth consistency). I fire this slip to cone 5/6 in an electric kiln. The temperature it can be fired to depends on the clay you use as the base of the slip.
Steps to Make:
Other things to keep in mind: