1. Indigo This is a great colour for shadows and darkening pretty much anything. You’d also be surprised how many people wear either black or navy, and it is fine for both. I never use black (it’s dead and heavy, in my view), so Indigo is a good alternative. Those familiar with my work will know that I am a fan of the limited palette, and if I didn’t have indigo I would fall at the first hurdle. This sketch made in a barber’s shop was composed almost entirely of indigo with a bit of variety for the hair and skin tones.