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Iron oxide pigments in jars: yellow, red, brown. Iron oxide red is a generic name of a ferric oxide pigment of reddish colors. Multiple shades based on both anhydrous Fe 2 O 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.
It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]
Number Sample Colour name Description, examples RAL 2000: Yellow orange: RAL 2001: Red orange: RAL 2002: Blood orange: U2 line of the Berlin U-Bahn: RAL 2003: Pastel orange: U9 line of the Berlin U-Bahn; the Helsinki Metro system
The color of red and other pigments is determined by the way it absorbs certain parts of the spectrum of visible light and reflects the others. The brilliant opaque red of vermillion, for example, results because vermillion reflects the major part of red light, but absorbs the blue, green and yellow parts of white light. [1]
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical ...
Spanish red, an iron oxide red [18] also known as torch red, is the color that is called rojo (the Spanish word for "red") in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.
Raw umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + n H 2 O + SiO 2 + Al 2 O 3. When calcined (heated) it is referred to as burnt umber and has more intense colors. Raw sienna (PBr7): a naturally occurring yellow-brown pigment from limonite clay. Used in art since prehistoric ...
Colour Index International (CII) is a reference database jointly maintained by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists. [1] It currently contains over 27,000 individual products listed under 13,000 Colour Index Generic Names. [ 2 ]