Dark roast means that the coffee bean has been roasted to a higher temperature and for a longer period of time than in light roast.

The shepherd's sea-girt reign; or, to the rocks Dire-clinging, gathers his ovarious food

2015, Clara Denina and Silvia Antonioli, Reuters Platinum sector faces its Kodak moment in fuel cell technology https://web.archive.org/web/20150601040240/http://af.reuters.com/article/investingNews/idAFKBN0OE1SC20150529

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