Strongly varied. For the most part (fols. 1–8, 10–19, 21–40, 45–76r, 77r–v, 89r–v, 185), two (or three) grades of initials: lombards (painted in red or pen-drawn and coloured) for the beginnings of feasts or for the beginnings of chants, and two sizes of (at times rather rough) pen-drawn intials, touched with red (orange), for the beginnings of sentences or for the beginnings of individual feasts; rubrics at times touched with red, mostly (if at all) distinguished by underlining or the drawing of a box around them. Infrequently also clefs and the terminations of a chant have been touched in red (e.g. fols. –, –v). Other decorative styles with similar uses of red can be found on fols. –, – (and possibly also) 186; and another on fols. –. There is also occasional use of green (or possibly a blue that has turned green) on fols. –, –, , –.

There are also large undecorated or uncoloured sections, of different styles, at fols. –, – (with the exceptions of fol. , ), –v, –, , –, –; a very distinct and for the most part uncoloured style is found on fols. –, –v, with pen-drawn initials with fat bulbous growths.