The colored output of an emerge command should documented in the emerge man page. While some of the colors may be obvious as they relate to a certain function, this is not always the case. Blue, for example, represents USE flags inside and outside of parenthesis. If blue is used in both cases, then what exactly does blue stand for? This should be addressed somewhere. Reproducible: Always Steps to Reproduce: 1.man emerge
blue means it's disabled ... seems clear to me
As colors are customizable theses days, not much point in referencing them. Also they aren't in any way authoritative, just a visual indicator.
