Ceramic - Pottery Dictionary

by Susan Mussi

GLAZE-BASE (a) Methods

ca: ESMALT-BASE (a) Mètodes

es: ESMALTE-BASE (a) Métodos

WARNING: Many glazes and stains can be toxic or give off poisonous fumes. When you buy your materials, be sure to know what they contain and the appropriate precautions to take when using them. Wear a mask and gloves when working with chemicals and make sure the room you are in is well ventilated. Great care is needed when there is the danger of inhaling fumes or using a spray that contaminates the air.

IN-GLAZE; is when the glaze-base and decoration are fired together. A piece of ceramic in the bisque state is covered with an opaque glaze-base and then decorated with colors; they are both fired together at 980º C as a result, they fuse and integrate to form a shiny glaze that accentuates the colors and leaves a smooth, vitrified, unbroken surface, where you cannot feel or see different levels. Read more about: In-glaze

ON-GLAZE; is firing a piece of pottery three times. The first firing turns the clay into bisque, for the second one you cover the bisque with an opaque glaze-base and for the last one it is decorated with colors. (This is also known as enamel decorating.)
Read more about: On-Glaze

UNDERGLAZE; are ceramic colors applied on to bisque or clay and covered with transparent glaze. The colors and the glaze can be fired separately in two firings or together in one.
Read more about: Underglaze

SLIP GLAZES; are transparent or opaque glazes that can be prepared with colors and textures. They are put onto the clay when it is dry, then both are fired together.
Read more about: Slip /Slip Casting / Slip decorating