Recent Examples on the WebFrom Californian poppy orange and Granny Smith green to flame red rust, even the more muted colors — think buttermilk yellow and gentle olive — make an impact. Georgia Murray, refinery29.com, 5 Feb. 2021 Iron oxides, the same compounds that create brown and red rust, are turning icebergs emerald. David Grossman, Popular Mechanics, 7 Mar. 2019