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x2y2

Color

Equations can use color:

• {\color{Blue}x^2}+{\color{YellowOrange}2x}-{\color{OliveGreen}1}
${\color{Blue}x^2}+{\color{YellowOrange}2x}-{\color{OliveGreen}1}$
• x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}
$x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}$

It is also possible to change the background color (since r59550), as in the following example:

Background Wikicode Rendering (in PNG)
White e^{i \pi} + 2 = 0 $e^{i \pi} + 2 = 0\,\!$
\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}e^{i \pi} + 2 = 0 $\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}e^{i \pi} + 2 = 0\,\!$
Orange e^{i \pi} + 2 = 0 $e^{i \pi} + 2 = 0\,\!$
\definecolor{orange}{RGB}{255,165,0}\pagecolor{Green}e^{i \pi} + 2 = 0 $\definecolor{orange}{RGB}{255,165,0}\pagecolor{DarkOrchid}e^{i \pi} + 2 = 0\,\!$
 $\color{Apricot}\text{Apricot}$ $\color{Aquamarine}\text{Aquamarine}$ $\color{Bittersweet}\text{Bittersweet}$ $\color{Black}\text{Black}$ $\color{Blue}\text{Blue}$ $\color{BlueGreen}\text{BlueGreen}$ $\color{BlueViolet}\text{BlueViolet}$ $\color{BrickRed}\text{BrickRed}$ $\color{Brown}\text{Brown}$ $\color{BurntOrange}\text{BurntOrange}$ $\color{CadetBlue}\text{CadetBlue}$ $\color{CarnationPink}\text{CarnationPink}$ $\color{Cerulean}\text{Cerulean}$ $\color{CornflowerBlue}\text{CornflowerBlue}$ $\color{Cyan}\text{Cyan}$ $\color{Dandelion}\text{Dandelion}$ $\color{DarkOrchid}\text{DarkOrchid}$ $\color{Emerald}\text{Emerald}$ $\color{ForestGreen}\text{ForestGreen}$ $\color{Fuchsia}\text{Fuchsia}$ $\color{Goldenrod}\text{Goldenrod}$ $\color{Gray}\text{Gray}$ $\color{Green}\text{Green}$ $\color{GreenYellow}\text{GreenYellow}$ $\color{JungleGreen}\text{JungleGreen}$ $\color{Lavender}\text{Lavender}$ $\color{LimeGreen}\text{LimeGreen}$ $\color{Magenta}\text{Magenta}$ $\color{Mahogany}\text{Mahogany}$ $\color{Maroon}\text{Maroon}$ $\color{Melon}\text{Melon}$ $\color{MidnightBlue}\text{MidnightBlue}$ $\color{Mulberry}\text{Mulberry}$ $\color{NavyBlue}\text{NavyBlue}$ $\color{OliveGreen}\text{OliveGreen}$ $\color{Orange}\text{Orange}$ $\color{OrangeRed}\text{OrangeRed}$ $\color{Orchid}\text{Orchid}$ $\color{Peach}\text{Peach}$ $\color{Periwinkle}\text{Periwinkle}$ $\color{PineGreen}\text{PineGreen}$ $\color{Plum}\text{Plum}$ $\color{ProcessBlue}\text{ProcessBlue}$ $\color{Purple}\text{Purple}$ $\color{RawSienna}\text{RawSienna}$ $\color{Red}\text{Red}$ $\color{RedOrange}\text{RedOrange}$ $\color{RedViolet}\text{RedViolet}$ $\color{Rhodamine}\text{Rhodamine}$ $\color{RoyalBlue}\text{RoyalBlue}$ $\color{RoyalPurple}\text{RoyalPurple}$ $\color{RubineRed}\text{RubineRed}$ $\color{Salmon}\text{Salmon}$ $\color{SeaGreen}\text{SeaGreen}$ $\color{Sepia}\text{Sepia}$ $\color{SkyBlue}\text{SkyBlue}$ $\color{SpringGreen}\text{SpringGreen}$ $\color{Tan}\text{Tan}$ $\color{TealBlue}\text{TealBlue}$ $\color{Thistle}\text{Thistle}$ $\color{Turquoise}\text{Turquoise}$ $\color{Violet}\text{Violet}$ $\color{VioletRed}\text{VioletRed}$ $\pagecolor{Black}\color{White}\text{White}$ $\color{WildStrawberry}\text{WildStrawberry}$ $\color{Yellow}\text{Yellow}$ $\color{YellowGreen}\text{YellowGreen}$ $\color{YellowOrange}\text{YellowOrange}$

Note that color should not be used as the only way to identify something, because it will become meaningless on black-and-white media or for color-blind people. See Wikipedia:Manual of Style (accessibility)#Color.