2nd Grade Clay colorful fish What is clay? Clay is made of very fine particles of decomposed rock that stick together. Clay particles are smaller than pebbles, sand & even silt. Clay forms through a process of weathering & erosion. It can be found in abundance all around the world. A great place to look for clay is along the banks of existing or dried up river beds. An artist digging for clay This eroding cliff shows many types of soils & rock areas of clay are circled. Greenware to Bisque • We can use clay to create many things including art! • When clay is wet, it is easy to mold & form. The pieces we create are called greenware. • Firing is the term for heating clay in a kiln the special oven used to bake clay. • The heat from the kiln causes the water to slowly evaporate from the clay, the clay particles bond together & the clay becomes hard. • We call our kiln fired clay pieces bisque KILN We fire our clay pieces at almost 2000 degrees Fahrenheit! • What do you think would happen if we fired a glass marble in our high temperature kiln? • The kiln temperature is so hot it would melt that marble into a puddle of glass! After 48 hours in the hot kiln, bisque projects are ready for glaze! • Glaze is the paint used to color clay projects • There are small particles of silica in our colorful glazes, when they are heated in the kiln they will melt into glass! Bisque pieces ready to unload from the kiln & glaze. Vocabulary Greenware: Unfired clay projects Bone Dry: Completely air dried clay Kiln: An oven used for firing clay projects Bisque: Clay which has been fired once, without glaze Fire: To heat clay in a kiln Glaze: Paint used to color clay projects. Glaze turns to glass when fired in a kiln.