Using Hump Molds in Slab Construction

Clay slab construction is fun and easy since thereallowed to dry until leather hard or when a light
are just so many possibilities of things you cantouch on the surface of the clay no longer leaves
make with slabs of clay. With just a slab roller oran imprint. Flat objects, such as tiles, can now be
a rolling pin and your imagination you can createbisque fired and then painted with glaze or with
great projects from tiles to fountains to furniture,glaze pencils or chalks and then overglazes.
not to mention pots and boxes. By using slump orThree-dimensional projects such as jewelry
hump molds you can make complete sets ofboxes, square or rectangular vases, and model
identical bowls and dishes Slabs of clay takebuildings or furniture are built up by joining slabs
textures well, so by pressing or rolling objects intotogether. First score the edges to be joined and
the surface of the clay slab or by pressing thethen glue them together with slip before bisque
slab into a texture mold, you open the door to allfiring. The basic clay slab can also be shaped by
kinds of possibilities for decorative surfacehand while still pliable to create masks, pinching up
effects. Rolling slabs out with a slab roller is muchthe nose and chin and pushing in eye sockets,
quicker and easier than using a rolling pin andthen defining cheek bones, brow, and mouth until
allows you to maintain identical thickness forthe form takes the desired expression. Details
plates, dinnerware, and other projects whichsuch as lips and eyebrows can be shaped from
require exact measurements. First the clay iscoils of clay and glued in place with slip.
placed between two strips of canvas, then it isTo make dishes, bowls, and other dinnerware it is
fed into the roller by cranking the two rolls. Theeasiest to use slump or hump molds. Hump molds
thickness of the slab is easily adjusted with nocan be obtained in a wide variety of shapes and
boards or shims; the roll opening and the handledepths. The slab is placed over the hump mold
are locked into place, and the knurled rolls grip theand pressed gently into it until it acquires the
canvas and pull the slab through quite easily. Slabsshape of the mold. After it has dried to
which are wet can be moved on the lowerleather-hard, it is trimmed to its final shape with a
canvas.fetting knife and pried from the mold. Remember
Once the slab is removed from the roller it canthat all ceramics which will come in contact with
be textured with a texture mold or by placingfood must be glazed with non-toxic lead-free
lace, leaves, seashells, or other found objects onglazes. These are just a few suggestions for the
the top surface and gently pressing the textureinfinite variety of ceramics projects which start
into the slab by hand or with a rolling pin. Shapesby rolling out a simple slab of clay.
can be cut out with a fetting knife and then