Art Van Gogh examined by Shell

Recent research of the paintings of Van Gogh by the laboratory of Shell and the Van Gogh-museum has proved that underneath the works examined is a first layer done with charcoal. This proofs that he was a less impulsive painter than thought by most people. He was even aware that the colors fainted by time and he complained about it in a letter to his brother. I always thought he was a romantic reinvention of the crazy artist we only talk about because of his letters. Researchers made an spectrograph of the paint used and found out that he experimented with lots of different types of paint that were new at the moment.