The Newton disc, also known as the Disappearing Colour Disc, is a well-known physics experiment with a rotating disc with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet or ROYGBIV) appearing as white (or off-white or gray) when it spins very fast.
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This type of mix of light stimuli is called temporal optical mixing, a version of additive-averaging mixing.[1] The concept that human visual perception cannot distinguish details of high-speed movements is popularly known as persistence of vision.

The disc is named after Isaac Newton. Although he published a circular diagram with segments for the primary colors that he had discovered, it is uncertain whether he actually ever used a spinning disc to demonstrate the principles of light.

Transparent variations for magic lantern projection have been produced.[2]

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