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Illustration depicting each format by color.
The Rainbow Books are a collection of CD format specifications.
Orange Book (1990)
Orange is a reference to the fact that red and yellow mix to orange. This correlates with the fact that CD-R and CD-RW are capable of audio ("Red") and data ("Yellow"); although other colors (other CD standards) that do not mix are capable of being burned onto the physical medium. Orange Book also introduced the standard for multisession writing.
- CD-MO (Magneto-Optical)
- CD-R (Recordable) alias CD-WO (Write Once) alias CD-WORM (Write Once, Read Many) – partially standardized as ECMA-394
- CD-RW (ReWritable) alias CD-E (Eraseable) – partially standardized as ECMA-395
Scarlet Book (1999)
Scarlet color of this book is a reference to the Red Book, which defines original CDDA.