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Plant Ash Toxicity

While the ash of most plants is very high in fluxing oxides like CaO and MgO, some plants take up much more free silica from the soil and have ash that can be high in silica particles (e.g. rice husk ash). Prolonged breathing of such exceptionally fine particled ash over time can cause silicosis.

When added to glaze suspension the ash will generally create a caustic and corrosive base that can cause skin reactions in some people (even severe reactions), thus is best to wear rubber gloves when working with ash glazes.


By Tony Hansen
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Materials Applewood Ash
A type of wood ash used as an ingredient in pottery glazes.
Materials Wood Ash
For centuries, pottery glazes have been made from ash mostly mixed with clay and feldspar.
Materials Rice Straw Ash
A type of plant ash sometimes used as an ingredient in pottery glazes.
Materials Rice Husk Ash
A type of plant ash used as an ingredient in pottery glazes.
Materials Eucalyptus Ash
A type of wood ash used as an ingredient in pottery glazes.
Hazards Silicosis and Screening
SILICOSIS and SCREENING by Edouard Bastarache
Glossary Wood Ash Glaze
Common washed wood ash can supply important ceramic oxides when melted, so it can comprise significant percentages in a recipe. Plus it can produce unique visual effects.

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