It was painted almost 600 years ago; the "Madonna at the Fountain" by Jan Van Eyck. Despite being a Charlotte’s favorite, she is reaching the limits of her ability. The minute details, the special use of oil paint and the slow-drying pigments play tricks on her. While the team is researching Van Eyck's complex oil painting technique, they are also travelling to Rome. In search for the deep blue ultramarine, in The Vatican they see the impact that Van Eyck had on his Italian contemporaries and lights a candle for Charlotte in the Santa Maria Maggiore.