Paper and clay on their own lack strength. But when they are put together in this air-dry paper clay recipe, you can do amazing things. (Even artificial bones!)
What is so great is that it requires few items to make this air-dry clay, cost hardly anything and recycles waste paper.
It is easier to model than clay on its own and dries fairly quickly. You can sculpt thinner and use an armature for support you can let your creativity free. (Its also possibleto attach pieces of different drying stages though keep the additional pieces covered to dry slowly to prevent cracking.) And another advantage is single firings with glaze on greenware or leaving completely unfired works its now possible to save time and money.
Watch the one minute run-down of this instructable here
Step 1: Things You Need for Air-Dry Paper Clay
Clay (stoneware looks so pristine, but terracotta will fire at lower temperatures)
Optional: About sodium silicate "Magic Water" to join coils and fix cracks (a low temperature fire may be sufficient)
Fine mesh fabric such as muslin
The clay can be dug up from your backyard or bought rock and debris free. I chose the latter type of clay to use.
There's a simple method of preparing your own dug up clays that I found interesting. (Watch the master potters of San Marcoshere!)
Step 2: Blending Paper
You may use any kind of clean paper for your air dry paper clay. I found newspaper began to disintegrate quickly once soaked in water and you do not need to soak the paper for a week. A few minutes will do.
If you do not have a blender - blenders are so easy to disfunction when blending too much paper at once - try the laundry scrubbing method.
I found it quick and simple to use the back of a floor tile and a bit of fabric and scrub the paper into tiny shreds. Fine toilet paper and newspaper are rather flimsy once wet so this process won't take long. The clay body is a lot smoother to sculpt if using finer papers.
Step 3: Drying the Paper Pulp
Use the fine muslin cloth (any fine fabric will do, I found a surgical mask was perfect) and pour a bit of the pulp through it. All the water will drain through leaving the finely mushed paper intact. Twist all excess water out.
Step 4: Mix Pulp and Clay
No kiln? No worries. There's always the BBQ! Steps to grilling your greenware on the BBQ here.
Professional Japanese potter Akira Yoshida, fires his pots in a tabletop grill (normally used to grill a Japanese meal) - called a Shichirin. It reaches to 1400 degrees celsius, perfect for stoneware clays. Take care with firing, as pieces may shatter if heated too quickly.
Step 5: Tandoor Oven - Firing Paperclay Tips
I found out how the enormous underground Tandoor Ovens are fired from by a book by Ranjit Rai entitled "Tandoor - Great Indian Barbeque". I've included pictures which pretty much describe the building process using a type of woolly-looking grass and clay.
Before using the tandoor, it needs to be cured. The process is described here "A certain amount of curing is necessary before the tandoor is fired for the first tie. A good new tandoor should be smototh from the inside. Green leaves, usually spinach are used to coat the inside walls. After a day, a mixture of buttermilk or khatti lassi, oil and salt is rubbed all over the inner walls and left overnight. This curing prevents the rotis and other breads from sticking to the walls of the tandoor when being cooked.
An expert's tip - a coating of molasses will serve the purpose just as well as the above ingredients.
After curing, the tandoor should be lit on low heat on the first and second day for a short duration of about half an hour each day. On the third day it is ready to be used. To keep your tandoor in good order, coat the inner walls with the paste of greens or molasses at least once every two weeks." (page 48 Curing - Tandoor Oven)
I wonder if the low temp firings over several days helps the clay body reach a bisque state eventually - like a simmering stew in a 'crock pot' (slow-cooker). This low temp firing technique seems to protect the huge tandoors from thermal shock or cracking. Also additions of grog made from wild grasses and other things help strengthen the tandoor. Sounds like a cob recipe!
NEW UPDATE! 2012:
"Magic Water" or "Magic Mud" will mend cracks for a super strong structure. Magic water is a made of sodium silicate, sodium carbonate (for washing clothes) and water. These fluxes react with the lime in the clay and bond into a super strong structure.
Step 6: Paperclay Sculpture - for Stop-Motion Animation
1. First I started bending an armature from wire.
2. Then I padded the armature with paper.
3. Next secured the padding with sticky tape.
4. Then modelled the clay over the skeleton.
5. Finally made the clothes from paper and coloured the clay with pastels and nail polish.
Here's a short clip of making the whole puppet. (The figurine is from a Korean animation I found online. I did not make the animation.)
Allen and Patty Eckman have managed to push paperclay to its limits with their incredible American Indian sculptures.