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Discover Ludwig"slate gray" is correct and is often used in written English.
It is used to describe something that is a very dark shade of gray. For example, "The walls were painted a dull slate gray."
Dictionary
slate gray
noun
A dark bluish grey colour.
Exact(31)
Beefy figures, silhouetted against a frigid slate gray sky, faltered up steep hills.
The L line is "slate gray," and the J and Z lines are "terra cotta brown".
"It was even painted in an unusual slate gray — his favorite color.
It quickly recedes, and the sky becomes a slate gray slab.
One night I came home to my boyfriend sitting on our slate gray sofa.
Adult: Head, body, and wing and undertail coverts are slate gray.
Similar(29)
Upperparts pale slate-gray, crown dusky.
Body slate-gray, slightly paler on underparts.
His slate-gray eyes illegible behind a Lone Ranger mask.
Slate-gray clouds rolling toward town threatened a bigger storm.
It's a city on the edge of the desert, surrounded by jagged, slate-gray mountains.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com