In muṣaḥḥaf jinās, two expressions are particularly close in their graphic shape, while a difference in dotting or a comparable distinguishing sign yields distinct words. The role of visual form must be distinguished from that of pronunciation.
Muḥarraf usually changes vowel or rest while preserving consonantal material. Muṣaḥḥaf is based on the kind of letterform similarity in which changing a dot, or its equivalent graphic distinction, alters the reading.
Arabic letters such as bāʾ, tāʾ and thāʾ, or jīm, ḥāʾ and khāʾ, illustrate graphic proximity. Yet not every pair of words containing such letters automatically forms muṣaḥḥaf jinās; the whole expression must exhibit the relevant likeness.