Why? You ask, well it turns out that the hero of haircare: argan oil, isn't all that heroic.

While argan oil is great for hydrating and repairing hair as well as smoothing dry ends, it has one major flaw - it's colour. Pump a few drops into your palm and you'll see what we're talking about, it's yellow. 

In it's purest form, Moroccan argan oil is a deep, golden yellow in colour. 

The argan oil used in beauty products is lightened slightly to a honey-dew shade but nonetheless, it's still yellow. So despite your best efforts to keep your hair brass-free, if you're using argan – you're hair is going to turn yellow.