Purple Book

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For the book associated with the British Labour Party see Purple Book (Labour Party) and for that associated with polymers, chemistry see Compendium of Macromolecular Nomenclature

Purple Book is the informal name for Sony and Philips' specification document for the double-density compact disc (DDCD) format. The Purple Book format allows a CD to hold 1.3 Gigabytes by narrowing the track pitch from 1.6 to 1.1 micrometre s, and shortening the minimum pit length from 0.833 to 0.623 micrometres.