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Ochre

OxideAnalysisFormula
CaO0.50%0.151
MgO0.20%0.084
Al2O36.02%1.000
SiO225.11%7.072
Fe2O355.64%5.886
MnO3.01%0.719
LOI9.50
Oxide Weight1531.61
Formula Weight1692.38
If this formula is not unified correctly please contact us.

Used in engobes, underglazes, and overglaze decoration for tan, brown and brick red hues.

Richard Willis

A ferric oxide earth with significant percentages of manganese and other metals that makes it quite suitable as an engobe to interact with an overglaze for “under-glaze” color; or to smoke-scorch before glazing in order to blacken the clay body. Traditional to celadons and aka, or “black body, red-glaze”, raku see iron earths, and the titled entry for yellow ochre
— yellow ochre: hydrated ferric oxide (Fe2O3 + H20)
— black, or “shadow”, ochre: hydrated FeO plus Mn
— red ochre: (“ruddle”) anhydrated ferric oxide (Fe2O3)

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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Ochre" descrip="" searchkey="" loi="9.50" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.501" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.200" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="6.027" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="25.113" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="55.645" tolerance=""/> <oxide symbol="MnO" name="Manganous Oxide" status="" percent="3.014" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="9.500" tolerance=""/> </volatiles> </material>


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