In the late fifteenth and early sixteenth centuries, successive archbishops of Salzburg attempted to consolidate their power and implement ecclesiastical reforms by means of commissioned printed liturgical books. Achieving uniform worship, however, proved difficult. In editions of the Missale Salisburgense, the revised musical mass prefaces required typographically challenging red notation. The addition or omission of coloured notes by printers and users reveals that the technical limitations of printing together with variable performance practices hindered liturgical uniformitas.