A correction fluid or white-out is an opaque, usually white fluid applied to paper to mask errors in text.
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It is typically packaged in small bottles, and the lid has an attached brush which dips into the bottle.
Before the invention of word processors, correction fluid greatly facilitated the production of typewritten documents.
A word processor is an electronic device or computer software application, that performs the task of composing, editing, formatting, and printing of documents.
One of the first forms of correction fluid was invented in 1956 by the secretary Bette Nesmith Graham, founder of Liquid Paper.
Liquid Paper is a brand of the Newell Rubbermaid company that sells correction fluid, correction pens, and correction tape.
Bette Nesmith Graham was an American typist, commercial artist, and the inventor of Liquid Paper.
With the advent of coloured paper stocks for officephotocopier use, correction fluid manufacturers began producing their product in various colours, particularly reds, blues and yellows, so that corrections made on these papers would be less visually invasive.