ABSTRACT
The practice of indicating preexistent material this way neither started with nor was limited to these court manuscripts (though not all scribes elsewhere used red ink for this purpose), but these sources were exceptionally generous in providing this extra material and rubricating it. Most often these indications were confined to the initial opening of a mass, but they sometimes extended through an entire composition. Needless to say, this auxiliary matter can provide extremely helpful clues for the analysis of a work.
