What is Ayumu Aikawa from Kore wa Zombie Desu ka?'s hair color? It looks like no brown I've ever seen...

Judging দ্বারা most of the প্রতিমূর্তি on Google, it's a grey with a slight brown hue.Some color swatches (though companies always disagree on these things) would lable the color anywhere from taupe to nickle alloy.