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Presentation on theme: "34."— Presentation transcript:

1 http://www.pixar.com/behind_the_scenes/Sculpting#/node/38 34

2  Review the different techniques of building with clay  Understand the importance of clay rules  Demonstrate Knowledge by becoming an “expert” at a technique and showing the class.  Create a clay sculpture representing your emotion.  Paint or glaze the clay sculpture to better demonstrate the emotion chosen  Reflect on the entire creative process

3  Slip  Plastic  Leather hard  Greenware (bone-dry)  Bisqueware ( once-fired)  Earthenware ( glaze-fired)  Stoneware (2 nd glaze, high fired)

4  Clay mixed with water  Yogurt like texture  Used to join two leatherhard pieces

5  Wet clay  Easily moldable  Cannot always support itself  Does not need as much slip to connect pieces

6  Can support itself and hold it’s own shape, but still workable  Carvable and joinable by score and slip

7  Bone dry and fragile – must dry slowly!  No moisture left in the clay  Not fired yet  Not workable

8  Fired once in the kiln at 1000°C/1800°F  Once cooled, it can be glazed or painted  Very porous- not capable of holding water

9  2 nd fire, low temperature  If it is not glazed, it is still porous and cannot hold liquid  Oldest form of pottery

10  High fired, 2 nd firing  Does not require glaze  Glass like (vitreous) - can hold liquid

11 Slab Coil Pinch

12  Prevents air bubbles- keeps your piece from exploding in the kiln!  Creates smooth all- over texture  Gets you to the PLASTIC stage by taking out some moisture

13  Technique needed to join two pieces together 1. Create scratches in both surfaces 2. Add slip on surface to prevent air bubbles 3. Firmly Stick together 4. Blend joining 5. REMEMBER: SCORE, SLIP, SMOOTH

14 1. Wedge Clay 2. Create a slab no more than 1 inch thick by rolling clay between two rulers 3. If pieces are thin, let them dry to leatherhard 4. Score and Slip all joints

15  Create a bottom shape  Create an even coil  Using scoring and slipping, coil a form.  Smooth out inside and outside coils to form a stronger bond – smoother during plastic stage.

16  Wedge, then form ball (hand-sized)  Stick your thumb in it  Put even pressure starting at the bottom and building up  Remember to keep it 1 inch thick or less- but keep it even!  Join two pinch pots together with newspaper to hold form to create hollow ball  ALWAYS poke an air hole in a hollowed out space!

17  Use a STAMPING tool  Do at plastic stage

18  Etch Into clay with tools- do at leather-hard stage!

19  Acrylic Paint  Watercolor paint  Glaze

20  Bottom MUST NOT be covered in glaze- protect with wax/ wash off with sponge if you accidentally get some on the bottom  WASH bisque ware off first and let dry  Brush to get specific colors- be aware they may melt into each other in the kiln.  Pour glaze on the inside, roll around, and pour left over glaze out.  Dip glaze and let excess drip off  Fire at 2350 degrees F

21  CLAY RULES  1. Soft clay cannot be attached to hard clay, and only pieces that are leather hard or wetter can be attached with much chance of staying together. This is due to the shrinking and flattening of clay particles as the water leaves during drying.  2. Pieces of clay to be attached must be scored with a needle, painted with slip, or slurry, to glue them together. Careful pinching and rubbing of seams may also join very wet pieces.

22 Clay pieces may be no thicker than 1 inch unless they are hollow, and if hollow spaces are enclosed, a pinhole must be made in the piece to allow gasses and trapped air to escape. Thicker pieces should be allowed to dry THOROUGHLY before firing. 4. Dry pots slowly, away from temperature extremes, to prevent uneven drying, shrinkage, and cracking. This is especially true of pieces, which have been joined, such as handles, slab pots etc.

23 5. Avoid stress when building or throwing clay pieces. Unnatural bending or forcing will cause particles to become unaligned, resulting in cracks, either in the drying or in firing. 6. Clay must be wedged before using to insure proper alignment of particles, create uniform texture, and most importantly, to drive air bubbles out. Air bubbles cause clay to explode in the kiln, because of the air expanding with no place to go. 7. Unused clay must be covered and wrapped with plastic to prevent drying, or returned to the recycling container.

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