- 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
||It has been suggested that this article be merged into Double-density compact disc. (Discuss) Proposed since February 2013.|
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.
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