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Study for Homage to the Square: “Michoacan”

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A photograph of two pieces of red ochre mineral against a white background

Dates of Use: Before 1 million years BCE–still in use today

Source: Natural inorganic pigment from a natural mineral

Chemical Name: Anhydrous iron (III) oxide

Formula: Fe2O3 (plus natural mineral impurities such as silica, calcium silicate, silicon, aluminum, phosphorus, and sulfur)

 

  • Red ochre comes from a naturally occurring mineral that is composed mainly of iron oxide. As a natural mineral it can include many impurities such as silica, calcium silicate, silicon, aluminum, phosphorus, and sulfur.
  • Red ochre can be found throughout the world in many different red tones and levels of transparency and opacity. 
  • Many ancient cultures used the pigment in burials. It was sprinkled through graves and also sometimes used to paint the deceased person.
  • A common name for red ochre is hematite or “bloodstone.” In ancient Greek the prefix “hem” means blood, and the suffix “-ite” means stone.
  • Red ochre is chemically stable and resistant to fading. It was used and valued by almost every culture in every time period. It is still used extensively today.

Red ochre stones can be mined straight from the earth and used like crayons for drawing.

Ochre can be ground against the surface of a stone to create a fine powder.

The powdered pigment can be made into paint by mixing with media. The media could be oil, egg, watercolor gum, or glue. Media could be anything that helps bind the pigment to the surface it’s being applied to.