2

Red indicates that something is wrong and requires attention/fixing. green indicates success. Where does this convention come from? I can think of traffic lights, but that's it.

example:

check marks

6

Red color has been psychologically associated to danger. Fire and Blood are some of the things that might have triggered this response to red.

http://www.color-wheel-pro.com/color-meaning.html

https://www.quora.com/Why-is-red-colour-associated-with-danger

Also, red light is least scattered and can be seen from really long distances. So, they were used both for danger and stop signals. Later, yellow and green were introduced in traffic lights. Follow the link below to know the history of how they were chosen.

http://www.todayifoundout.com/index.php/2012/03/the-origin-of-the-green-yellow-and-red-color-scheme-for-traffic-lights/

These metaphors were slowly adopted into graphic and UI design for wrong and right. Red - Stop - Wrong. Green - Go - Right.

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