シャルル＝フランソワ・ドービニー
This changed in the 1800s, when tubes of oil paint became available allowing "En plein air" painting to become viable for many artists. In the 1830s, the Barbizon school in France that included Charles-François Daubigny and Théodore Rousseau used the practise to accurately depict the changing appearance of light as weather conditions altered.