atramentous en · ADJ
Etymology
From Latin ātrāmentōsus, from ātrāmentum (“black liquid, ink”). Equivalent to atrament + -ous.
Meanings
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Synonym of inky, black, inklike.
Perdido Street Station was the centre of the city, even more than Parliament, the atramentous keep now empty of functionaries […]
2004, China Miéville, Iron Council, Trade paperback, published 2005, page 464:The ſecond way whereby bodies become blacke, is an Atramentous condition or mixture, that is a vitriolate or copperoſe quality conjoyning with a terreſtrious and aſtringent humidity, for ſo is Atramentum ſcriptorium, or writing Inke commonly made, by copperoſe caſt upon decoction or infuſion of galls...
1646, Thomas Browne, Pseudodoxia Epidemica, Book 6, Chapter XII: "A Digression Concerning Blacknesse", p. 336