About the colors:

Red is used to indicate that a particular story is bogus.  In quotations it means that the words are fake–misattributed, distorted, or interpolated.

Purple is used to indicate that a quotation is removed from its alleged source. It is something that has been attributed to him or her, but has passed through someone else’s memory, usually after time has gone by.

Blue indicates a quotation that is close to genuine, but may have problems with precise wording, silent omissions (that do not distort the meaning; a key silent omission earns the red designation), or it may be used to designate the genuine portion of a mangled quotation.