Changes

==Origin==

==Origin==

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''steynen'', partly from Anglo-French ''desteindre'' to take away the [[color]] from & partly of Scandinavian origin; akin to Old Norse ''steina'' to paint  

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''steynen'', partly from Anglo-French ''desteindre'' to take away the [[color]] from & partly of Scandinavian origin; akin to Old Norse ''steina'' to paint  

*[http://en.wikipedia.org/wiki/14th_century 14th Century]

*[https://en.wikipedia.org/wiki/14th_century 14th Century]

==Definitions==

==Definitions==

*1: to suffuse with [[color]]

*1: to suffuse with [[color]]

A secondary [[method]] of stain involves a [[chemical]] or [[molecular]] [[reaction]] between the material and the staining material. Many types of [[natural]] stains fall into this category. Finally, there can also be [[molecular]] [[attraction]] between the material and the staining material, involving being held in a covalent bond and showing the [[color]] of the bound substance.

A secondary [[method]] of stain involves a [[chemical]] or [[molecular]] [[reaction]] between the material and the staining material. Many types of [[natural]] stains fall into this category. Finally, there can also be [[molecular]] [[attraction]] between the material and the staining material, involving being held in a covalent bond and showing the [[color]] of the bound substance.

Different types of material can be stained by different substances, and stain ''resistance'' is an important characteristic in [[modern]] [http://en.wikipedia.org/wiki/Textile_engineering textile engineering].

Different types of material can be stained by different substances, and stain ''resistance'' is an important characteristic in [[modern]] [https://en.wikipedia.org/wiki/Textile_engineering textile engineering].

In many cases, stains can be affected by [[heat]] , and may become [[reactive]] enough to bond with the underlying material. [[Extreme]] heat, such as from ironing or dry cleaning, can cause a [[chemical]] [[reaction]] on an otherwise removable stain, turning it into a chemical compound that is impossible to remove.

In many cases, stains can be affected by [[heat]] , and may become [[reactive]] enough to bond with the underlying material. [[Extreme]] heat, such as from ironing or dry cleaning, can cause a [[chemical]] [[reaction]] on an otherwise removable stain, turning it into a chemical compound that is impossible to remove.

Various laundry [[techniques]] exist to attempt to remove or minimize existing stains, and stain removers are an important type of [[chemical]] in [http://en.wikipedia.org/wiki/Laundry_detergent laundry detergents]. Some stand-alone stain removers also exist.

Various laundry [[techniques]] exist to attempt to remove or minimize existing stains, and stain removers are an important type of [[chemical]] in [https://en.wikipedia.org/wiki/Laundry_detergent laundry detergents]. Some stand-alone stain removers also exist.

[[Category: Chemistry]]

[[Category: Chemistry]]

[[Category: General Reference]]

[[Category: General Reference]]