My first thought was actually the IUPAC's Orange Book (https://iupac.org/what-we-do/books/orangebook/ https://iupac.org/what-we-do/books/orangebook/). Then I re

My first thought was actually the IUPAC's Orange Book (https://iupac.org/what-we-do/books/orangebook/ https://iupac.org/what-we-do/books/orangebook/). Then I realized this is a tech site, so maybe this was talking about the Orange Book of the CD specification (https://en.wikipedia.org/wiki/Rainbow_Books#Orange_Book_(1990) https://en.wikipedia.org/wiki/Rainbow_Books#Orange_Book_(199... ). My conclusion from all of this: people need to stop naming books after rainbow colors.