Eyeko Eye Do Liquid Eyeliner is so good that Alexa Chung has given it her handwritten stamp of approval – signed, sealed, delivered. Single stroke colour that doesn't skip or drag but glides on for a smooth, carbon black finish. ‘An eyeliner pen – guaranteed to last longer than a pencil, even over shadow – which actively thickens the lashes after 15 days of use’ – Vogue