Mold that appears in moist clay is not only harmless, it's beneficial. Mold will improve the clay's plasticity, making it easier to work with. Some people even introduce organic matter such as old rotting leaves into their clay to promote the growth of mold.
Ceramics
Today
It is rare that a clay as dug from the ground will suit our needs for forming. Typically we alter the clay by mixing it with other clays, silica, feldspar and grog or sand. We call the resulting mixture a clay body. Another clay might be added to increase the plasticity of a less plastic clay or to alter its color and texture. Silica, is added to control shrinkage and to increase the thermal expansion of the body to help make glazes "fit" the body. Feldspar or other fluxes are added to decrease the temperature at which the body will fuse (vitrify) to become water tight. Grog is added to control shrinkage and cracking as the clay dries.
Hand Mixing from Scratch
Hand mixing from scratch follows the reclaiming process fairly closely but you start with already dry powdered constituent materials. The trick is getting the dry powder materials blended without raising a lot of dust. I have seen dry clay blended outside in a kiln yard using hoes, rakes and other farm implements. This is messy and of course a respiratory hazard. (Anyone recognize a theme here?) Dry materials can be sealed in a large bag and massaged about in an effort to blend the materials, but you will be limited by how much clay you're physically capable of wrestling with! If you have a ball mill, the dry materials can be loaded into a large container, sealed and placed on the mill to turn...
Very hard, opaque, water-resistant pottery made of non-porous clay with feldspar and a high silica content, fired to the point of vitrification (1,200-1,280ş C) Glazing decorates and gives it a smooth finish; it usually fires to shades of gray or buff, though some red stonewares do exist. The earliest examples are Chinese, from the 10th to 3rd centuries BC. From the 9th century AD stoneware was made in N Europe; in Britain from the late 17th century.
What precautions should I take in the studio?
How do I fire an electric kiln?
What are some stoneware glazes?
What Precautions when using dry ingredients?
How do I apply opaque stains ?
What should I keep in mind when designing my studio?
What tools do I need to start potting?
How do I best promote myself and my work?
What safety aspect should I keep in mind when working with glazes?
What should I remember when firing the kiln?
How do I best publicise my business?
How do I make a simple plaster mold?
How do I fire overglazes/lustres?
How do I create fine feature lines?
How and when sholuld I apply underglazes?
Are they Water or oil base stains?
Are any two kilns are exactly alike?
Can I use sand to stop glaze running onto shelves
Does greenware need to be dry before loading?
What is the history of the Potter´s Wheel?
What is The History of the Way of Tea
What is Celadon (Cheong-Ja) - the Stuff of Kings?
What is an overglaze marbleizer?
Is there a trick toThrowing Porcelain?
What are some stoneware glazes?
What are some good tools for decoration?
How do I apply texture to my piece?
Do I need kiln wash for bisque?
How do I refire a glazed piece ?
What must I remember when Raku firing?
How do I add decoration to my ceramics?
How do I care for my elements?
Does over firing produce poor colour in coloured glaze?s
What are some Black Firing Tips and Tricks?
What is the safest way to pack my ceramics?
How do I do a reduction firing?
automatic kiln sitter, should I trust it?
What are some tips for draining a mold?
What safety measures should I take with Raku Firing?
How do I attach a bat to the wheelhead?
What tools do I need for ceramics
What are suggested plate clay weights?
What do I need to get started?
What tools do I need to make a coil pot
How do I fire ceramic bisque ?
How do I recycle batches of clay quickly
What is the correct firing time?
How to I prepare and make slabs?
What materials are toxic in Ceramics?
Can Crackle glazes be used for food?
How do I avoid S cracks in wheel thrown ware
How do I get the press onside?
What are the Approx. firing times?
Ho do I avoid pitting and pinholes?
How do I decorate my ceramics?
How do I Bisque fire in an electric kiln?
How do I decorate my ceramics?
How do I apply crackle glazes ?
What effects can I achieve with a brush?
How do I Drain small pour holes?
How do I care for my new Kiln?
can I draw directly onto a piece?
How do I fire different bodies?
What is the humming in my new kiln?
What should I remember when firing a new kiln?
how do I get the best results in glazing?
How do I prevent dirt on my greenware?
How do I accomodate Clay Storage in my studio?
How do I prevent sagging during firing?
How do I load my brush for applying underglaze?
Why should I use pottery plaster?
How do I prevent glazes from settling ?
How do I create a woodtone effect?
What are some Doing well Quotes?
How do I care for my elements?
How do I store my throwing tools?
What is the history of Ceramics?
Why do I get black spots in my glaze?
How do I load my kiln for a glaze firing?
Guru Spotlight |
Jolyn Wells-Moran |