Iconofile: Ochre, French Havane [4 oz. jar]

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Ochre, French Havane [4 oz. jar]

Item No: 430:370100
Category: 29

Price: $3.95

Quantity:

Description:
Net vol 4 oz
Our French Ochre is from the last remaining European company operating the ochre deposits in the French quarries of Gargas and Rustrel nested in a 12 miles long enclave in the heart of the Luberon Mountains, the ochre country.

Ochre is a symphony of colors ranging from pale yellow through the orange range to an intense red. It has two major characteristics: it never fades in the daylight and the color is highly concentrated.

Known since the antiquity, ochre (okhra in Greek) occurs naturally as yellow ochre (iron oxide limonite) or as red ochre (iron oxide hematite). Ochre grades into sienna, a yellow-brown pigment containing a higher percentage of iron ore than ochre as well as some manganese dioxide. Sienna grades into umber, which is darker brown and contains a higher percentage of manganese dioxide. Burnt sienna is brown or bright red, burnt umber is a darker brown than umber.

Ochre is not naturally usuable as a pigment and therefore needs to undergo several important processes, such as:

Ore extraction in the quarries.
Separation of ochre and sand using water and centripetal action for the cleaning procedure.
Calcinations of the raw yellow ochre to obtain red ochre by heating it for 15 minutes at a temperature between 932°F /1112°F.
Mixing different ochre extracted from diverse veins is necessary to obtain the selected colors. Then it’s grinded to 50 microns and packed.
Ochre extraction is as well controlled as any other mining. The use of a daily volume of water of 264.17 cubic gallons is necessary to clean the ochre production.

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