This is the 4716th most frequent Russian word.
жирными
The word "жирными" in English means "fat" or "bold" (instrumental plural or instrumental singular feminine).
Here, 'жирными' is used as an adjective in instrumental plural form, referring to a style of font or text weight in a typographic context.
Эти строки обычно выделяют жирными, чтобы они бросались в глаза.
These lines are usually highlighted in bold so they stand out.
In this sentence, 'жирными' describes the sauces as rich or fatty, connecting its meaning to food characteristics.
Он любит блюда, которые приготовлены с жирными соусами.
He likes dishes prepared with rich sauces.
In the context given, 'жирными' defines the ink as bold or heavy, highlighting its physical properties.