The story
(crude oil; coal; black pepper): From its black colour and high value.
Etymology from Wiktionary, CC BY-SA 4.0.
black gold
Today it means: Raw petroleum; crude oil. Full definition →
Today it means: Raw petroleum; crude oil. Full definition →
(crude oil; coal; black pepper): From its black colour and high value.
Etymology from Wiktionary, CC BY-SA 4.0.