CSS3 transitions want to add a colour and fade it away

I want to make a DIV background (which doesn't have a background color) flash red then ease out to blank again. now I have used JS to add a new CLASS (which adds the red) to the DIV in question and CSS3 to add an easing to the background color. but it eases it IN, what I want is it to go RED then ease out. I guess I could do this by using JS to add multiple CLasss after a delay. but can CSS3 be used to do this entirely?

cheers

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