And now for something a little less revolting for your medieval beauty regimen: a leave-in conditioner from Trotula. Remember that charcoalized vine tendril? Well, it's back, this time mixed with some barley chaff, the root of the sowbread (cylclamen for the modern gardener), and some ground liquorice root. This is boiled for 15-20 minutes, strained, and rinsed through your hair. Not sure how it would work for blondes, though.