COMMENT FAIRE DE LA COULEUR D’OCRE?

D’où vient l’ocre?

L’ocre est le nom général d’un groupe de pigments de terre, comprenant: l’ocre rouge, l’ocre jaune, l’ocre pourpre, l’ombra et la terre de sienne. Le principal minéral d’ocre est la limonite (hydroxyde d’oxyde de fer (III)). Cela donne à chacun une couleur jaune clair.

L’ocre rouge tire sa couleur rougeâtre de l’hématite minérale (Fe2O3), qui est un oxyde de fer.

L’ocre jaune est la limonite (FeO (OH) -nH2O) et est également appelée ocre dorée.

L’ocre violette est identique en éléments chimiques à l’ocre rouge, mais légèrement différente en raison de la façon dont la lumière s’en diffracte en raison d’une taille moyenne des particules légèrement plus grande.

L’ocre brune, la goethite (FeO (OH)), est un oxyde de fer partiellement hydraté. L’ambre contient entre cinq et vingt pour cent de manganèse, ce qui en fait un brun plus foncé. La terre de Sienne contient de la limonite et une petite quantité d’oxyde de manganèse, environ 5%, ce qui la rend plus foncée que l’ocre.

Code ocre rouge: # 7D3F32

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