This paper focusses on colour terminology as a tool for achieving ἐνάργεια (pictorial vividness) in the Latin poetry of the first century c.e. After briefly outlining the developments in the concept of ἐνάργεια from Aristotle to Quintilian, the paper considers the use of Latin terms for black in three descriptive passages from Statius’ epic poem, the Thebaid. It is observed that the poet privileges the juxtaposition of the two adjectives ater and niger in a pattern of uariatio, where ater often carries a figurative meaning and repeats established poetic clichés, while niger is part of unparalleled collocations that evoke a material notion of blackness. Further analysis of the uariatio in the context of each passage reveals that the juxtaposition of the two-colour terms enhances the vividness of the objects described not only by increasing their chromatic impact but also by establishing connections with other parts of the poem, and by inviting a reflection on the competing practices of imitation and transgression of poetic models. The analysis of one stylistic feature (the use of colour terms in uariatio) shows that this stylistic feature is used by Statius for achieving ἐνάργεια as an artistic effect, for reflecting on ἐνάργεια as an instrument through which poetic models are challenged, and for tying his own poetic practice to contemporary rhetorical discussions.