“The Ancient Britons’ secret weapon? Woad could be mixed with yellow from the meadow plant weld, or from another native plant, dyer’s greenweed (genista tinctoria; despite its English name it dyed yellow), to give the green that Robin Hood and his merry men famously wore. Red, another favourite medieval colour, could be obtained from the roots of another native plant, madder. Mixed with woad it produced a soft purple. A deeper purple came from a lichen, orchil, imported from Norway, or ‘brasil’, a wood imported from the East Indies and correspondingly expensive. The deepest purple came from kermes, derived from insects from the Mediterranean basin called by the Italians ‘vermilium’ (‘little worms’, hence vermilion) and by the English ‘grains’. Its cost limited it to the most luxurious textiles. A good pink could be had from the resin of dragon’s blood trees, although some medieval authorities traced it to the product of a battle between elephants and dragons in which both protagonists died. Most of these dyestuffs needed a mordant to give some degree of light-fastness – usually alum, imported from Turkey and Greece.”