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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.

Related Information

Links

Materials Applewood Ash
Materials Wood Ash
Materials Rice Straw Ash
Materials Rice Husk Ash
Materials Eucalyptus Ash
Hazards Silicosis and Screening
Glossary Wood Ash Glaze
Common washed wood ash has a chemistry akin to a ceramic glaze, so it can comprise significant percentages in a recipe. Plus it can produce unique visual effects.

By Tony Hansen


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