red ink

Evidence

"The decoration of the sura headings, the page layout, marginal variant readings in red and black ink and an approximate number of lines on one page indicate that MS-QUR002 belongs to the same corpus"

Remarks

Red ink is consistently used for marginal variant readings and corrections (p. 54). It is also used in the marginal ornaments (Figure 2.5) that mark different parts of the Qur'an such as the juz’, Hizb, Nisf, and Rub’ (p. 49).