An index card is a type of heavy paper that is cut to a standard size, often used for recording individual information that can be filed and easily rearranged. The most common index card size used in the United States is 3-by-5 inches. Other sizes available include 4x6, 5x8, and ISO A7 (74mm x 105mm). It is commonly white but is also available in colored.
There are special index card holders with protruding tabs for organizing the index cards. Index cards are popular for organizing ideas, quotes, references for research, term papers, and for managing free-form information.
Drying: Choose an index card that is porous and dries fast when written on. It should absorb ink from pens, typewriters, and printers instantly to avoid smudging.
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