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Unnoticed — Fotopedia
I took this as "Odd one out" for the monthly scavenger hunt, and as I was uploading it I noticed the drip of red paint on one of the pieces of slate.
Wikipedia Article
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Slate gray

Slate gray is a gray color with a slight azure tinge that is a representation of the average color of the material slate.

The first recorded use of slate gray as a color name in English was in 1705.


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