Assertion: black ink | /r/HasProperty | the most common color
Facets:
value: for the same reason
type: CAUSE
Source sentences:
text: Black ink is the most common color used for printing books, newspapers and documents, as it provides the highest contrast with white paper and thus the easiest color to read.
text: Because of its contrast and clarity, black ink on white paper continued to be the standard for printing books, newspapers and documents; and for the same reason black text on a white background is the most common format used on computer screens.