How many primary colours can you find in Vincent’s painting ‘Irises’? 🧐 Vincent generally tried to achieve a powerful visual harmony in his paintings. He therefore studied numerous books on colour theory, trying to understand how colours work. Vincent regularly used complementary colours: colours that intensify each other, such as blue with orange, red with green or purple with yellow. In this case, he used purple and yellow as the dominant pair. Unfortunately, the purple has discoloured to blu