OCRE ROUGE: Composition et code dans le tableau des couleurs

Composition d’ocre rouge

Le principal composant qui donne la couleur de l’ocre rouge naturelle (ocre) est composé d’hématites (∝-Fe2O3). Le terme ocre rouge ou terre rouge décrit plusieurs types de pigments d’oxyde de fer tels que le rouge vénitien, le rouge ivoire, le rouge anglais et le rouge indien. La nomenclature n’est nullement univoque et plusieurs auteurs ont utilisé les noms différemment.

L’ocre rouge est composée uniquement d’oxyde de fer, hématite dont le mot vient du grec, hema signifie sang. Utilisés depuis la préhistoire et tout au long de l’histoire, ces pigments permanents peuvent être mélangés en toute sécurité avec d’autres pigments. Les ocres varient considérablement en transparence; certains sont assez opaques, tandis que d’autres sont appréciés pour leur utilisation comme émaux.

Code ocre rouge: # 7D3F32

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