Wiktionary
slate grey
n. (alternative form of slate gray English)
Usage examples of "slate grey".
Saul revelled in the banality of the view, the slate grey, the lacklustre billboard ads, peeling and out of date, the obscure graffiti.
The sky was slate grey, the sun no more than a faint patch of brightness behind the clouds.
The white of the First's eyes was the colour of honey, his pupils a murky, slate grey.