In one 15th-Century text, the French herald Jean Courtois couldn't contain his enthusiasm for the colour of chlorophyll: "There is nothing in the world more pleasant than the beautiful verdure of fields in blossom, broad-leafed trees covered in foliage, banks of the rivers where the swallows come and bathe, stones that are green in colour, like precious emeralds," he wrote. "What is it that makes April and May the most pleasant months of the year? It is the verdure of the fields, which prompts the small birds to sing and to praise spring and its delightful gay green livery."

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