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What is "Metamerism" - Definition & Explanation

Variations in color perceived under different light, surrounding colors, or by the observer's sense of color. http://en.wikipedia.org/wiki/Metamerism_(color)
A marked change in the colour of an object with a change in the spectral composition of the light by which it is viewed.
NOTE:
Metamerism can be judged only with reference to the changes occurring in other objects in the fields of view as the illumination is changed.
A metamerism occurs when the color standard and the submit do not match under all lighting conditions. This means that a solid color fabric when viewed under two different lights in a commercial light box, will appear to cast two different colors. The correct technical definition for metamerism is a conditional match that is, two or more samples match for one observer under one light source, but not under a different light source for that same observer.

Some other terms

Some more terms:

A weave used principally for towels and glass-cloths in which a rough surface effect is created on a plain ground texture by weaving short floats, whereby warp floats are on one side of the fabric...
Felt is a cloth made without weaving (a non-woven) which is produced by matting, condensing and pressing fibers. Loden is a type of felt originally worn in the Alpine regions, which has recently...
Refers To Fabrics Knit On A Circular Knitting Machine, I.e. One Which Has Its Needles Arranged In A Circle Thus Producing The Fabric In Tubular Form . The Fabrics May Be Sold Tubular Or Slit And Sold...
Fabrics that are not from natural origins. Synthetics include manmade polyesters and polyvinyl fiber derivatives such as Acrylic, Nylon and Spandex that have been synthesized from petroleum and...
The forced circulation of dye liquor through packages of fibre, yarn or fabric, without limitation of temperature. NOTE: The use of the term "pressure dyeing" in this connection is deprecated. (See...

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