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The clay aging myth: Prove it wrong by slurry mixing

Do you really need to age clay when you make your own? No. In ancient Japan they did not have power blenders and propeller mixers. We do. To illustrate: I just sieved out the +80 mesh and +200 mesh particles from this raw clay (from one of our stockpiles) and then propeller-mixed it as a slurry. That wetted the particles very well and made it easy to sieve. Then I poured the slurry on to a plaster table and thirty minutes later it was ready-to-use. Slurry mixing is just as good as deairing in a pugmill. No wait! Particles wet even better. The plasticity of this clay is wonderful, and, it will not get any better with aging. Ancient Japanese potters used non-plastic, coarse particled clays so they needed to squeeze every last bit of plasticity out of them. Today, fine particled plastic clay materials are readily available. And we have something else the ancients did not: Micro-fine bentonite. A few percent of that and any clay can be made super-plastic (provided you have a good mixer to wet and separate all the particles to release their full power).

Clay aging: It is a myth

Related Pictures

These are behind the art center. A dirty secret. Or an opportunity!


Barrels of scrap clay behind the art center

When many clays are in use there is good reason to collect like this - you will see why in a moment. Each barrel is a unique product, a mix of random clays used by students. Each could be thus considered a wild clay, inconsistent throughout and with impurities. As such, each needs to be characterized, as a whole. For example, consider the front barrel: What does it look like when fired at various temperatures? At what temperature does it mature? What is the drying shrinkage and how plastic is it? Does it fit the glazes we use? This information not only describes the clay but also points to what needs to be added to make it useful (e.g. bentonite or feldspar). An account at Insight-Live.com is a way to organize the testing and post the results to a group (the SHAB test, for example, is perfect to describe the plastic, drying and firing properties). Once the clay in a barrel becomes predictable then it becomes useful.
To do the testing it is necessary to get a representative sample from each barrel. The method depends on how processing will be done. In a wet climate, the wet contents are likely to be thrown into a pugmill (with impurities), recycled until mixed and then bagged - a sample can be taken when complete. But the dry climate option is much better: Dewater each barrel, do quartering to get a representative sample and then characterize it. Finally, slake, slurry up batches using a propeller mixer, screen in a vibrating sieve and then dewater (e.g. on a plaster table).

Mix the slurry using a propeller mixer


Leave it mixing long enough under a mixer to thoroughly wet the surfaces of all the particles.This is a powerful mixer that can put a lot of energy into the slurry and it only takes a few minutes for it to be silky smooth.

Links

Materials Bentonite
Bentonite can make a clay body instantly plastic, only 2-3% can have a big effect. It also suspends slurries so they don't settle out and slows down drying.
Glossary Propeller Mixer
In ceramic studios, labs and classrooms, a good propeller mixer is essential for mixing glaze and body slurries.

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