What is the scratching into the clay before slipping and joining?

Scratching into the clay before applying slip and joining pieces is a technique known as "scoring." This process creates a rough surface that enhances adhesion between the joined pieces of clay. The scratches allow the slip (a liquid clay mixture) to bond better, ensuring a stronger connection once the pieces are assembled and fired. Scoring is essential in ceramic work to prevent seams from separating during drying or firing.