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Iron oxide red
Iron oxide red is a generic name of a ferric oxide pigment of reddish colors. Multiple shades based on both anhydrous Fe
2O
3 and its hydrates were known to painters since prehistory. The pigments were originally obtained from natural sources, since the 20th century they are mostly synthetic. These substances form one of the most commercially important groups of pigments, and their names sometimes reflect the location of a natural source, later transferred to the synthetic analog. Well-known examples include the Persian Gulf Oxide with 75% Fe
2O
3 and 25% silica, Spanish red with 85% of oxide, Tuscan red. Other shades of iron oxides include Venetian Red, English Red, and Kobe.
The anhydrous pigment has a dark purple-red or maroon color, hydrates' colors vary from dull yellow (yellow ochre) to warm red.
The iron oxide red is extremely stable: it is not affected by light and most chemicals (soluble in hot concentrated acids); heat only affects the hydrated variants (the water is removed, and the color darkens).
Indian red is a pigment, a variety of ocher, which gets its color from ferric oxide, used to be sourced in India, now made artificially.
Chestnut is a color similar to but separate and distinct from Indian red.[citation needed]
The name Indian red derives from this pigment being originally imported from India, where red laterite soil is found, composed of naturally occurring iron oxides.[citation needed] The first recorded use of Indian red as a color term in English was in 1672.
Deep Indian red is the color originally called Indian red from its formulation in 1903 until 1999, but now called chestnut, in Crayola crayons. This color was also produced in a special limited edition in which it was called Vermont maple syrup.
At the request of educators worried that children (mistakenly; see Etymology) believed the name represented the skin color of Native Americans, Crayola changed the name of their crayon color Indian Red to Chestnut in 1999.
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Iron oxide red AI simulator
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Iron oxide red
Iron oxide red is a generic name of a ferric oxide pigment of reddish colors. Multiple shades based on both anhydrous Fe
2O
3 and its hydrates were known to painters since prehistory. The pigments were originally obtained from natural sources, since the 20th century they are mostly synthetic. These substances form one of the most commercially important groups of pigments, and their names sometimes reflect the location of a natural source, later transferred to the synthetic analog. Well-known examples include the Persian Gulf Oxide with 75% Fe
2O
3 and 25% silica, Spanish red with 85% of oxide, Tuscan red. Other shades of iron oxides include Venetian Red, English Red, and Kobe.
The anhydrous pigment has a dark purple-red or maroon color, hydrates' colors vary from dull yellow (yellow ochre) to warm red.
The iron oxide red is extremely stable: it is not affected by light and most chemicals (soluble in hot concentrated acids); heat only affects the hydrated variants (the water is removed, and the color darkens).
Indian red is a pigment, a variety of ocher, which gets its color from ferric oxide, used to be sourced in India, now made artificially.
Chestnut is a color similar to but separate and distinct from Indian red.[citation needed]
The name Indian red derives from this pigment being originally imported from India, where red laterite soil is found, composed of naturally occurring iron oxides.[citation needed] The first recorded use of Indian red as a color term in English was in 1672.
Deep Indian red is the color originally called Indian red from its formulation in 1903 until 1999, but now called chestnut, in Crayola crayons. This color was also produced in a special limited edition in which it was called Vermont maple syrup.
At the request of educators worried that children (mistakenly; see Etymology) believed the name represented the skin color of Native Americans, Crayola changed the name of their crayon color Indian Red to Chestnut in 1999.