Ochre is a family of earth pigments, which includes yellow ochre, red ochre, purple ochre, sienna, and umber. The major ingredient of all the ochres is iron(III) oxide-hydroxide , known as limonite , which gives them a yellow colour.

2018年11月20日 · Ochre (pronounced OAK-er) is clay pigmented by hematite, a reddish mineral that contains oxidized iron, which is iron that's been mixed with oxygen, said Paul Pettitt, a professor of paleolithic...

2019年7月3日 · The natural yellow-red-brown pigment known as ochre was humankind's first paint pot, used by our hominid ancestors nearly 300,000 years ago.

Red ochre takes its reddish colour from the mineral hematite, which is an anhydrous iron oxide, and the main ingredient of rust. It was one of the earliest pigments used by man. Hand prints made by using red ochre have been found in the Pech Merle cave in Southern France. They date to between 16,000 and 25,000 BC.

Red ochre is a pigment that has been used by humans for more than a million years. It was highly prized and used by almost every culture in every time period. The earliest known human-made object that might be considered an artwork is an engraved lump of red ochre.

Red ochre is composed mailnly of iron oxide, hematite which word comes from Greek, hema meaning blood. Used from prehistory and throughout history, these permanent pigments can be safely mixed with other pigments.

2024年12月27日 · Ochre, a native earth colored with hydrated iron oxide. It varies in color from pale yellow to deep red, brown, and violet. There are two kinds: one has a clayey basis, while the other is a chalky earth. The former variety is in general the richer and purer in color of the two.