same colour ink; other colours; different kinds of ink

Evidence

"The text is usually written in the same colour ink (apart from important words or headings written in some cases in other colours)... in many cases, parts of the fragments are written in a different handwriting, sometimes in different kinds of ink."

Remarks

In medical books found in the Genizah, ink consistency is a key codicological feature; a single hand and single color are typical for the main body of text, while rubrics or headings may utilize contrasting colors (p. 494). In contrast, medical notebooks (an intermediary genre) often exhibit variability, where different entries or additions within the same fragment might be written in different handwritings and distinctly different types of ink, reflecting their use as personal, evolving repositories of practical knowledge (p. 499).