•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.


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)

Out Bound Links

In Bound Links

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>

Feedback, Suggestions

Your email address


Your Name


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved