Question: What was the color of the table that Gachet rested his elbow on in Van Gogh's painting?
About the article "Portrait of Dr. Gachet", section "Composition".

Candidate passages:
Gachet and his daughter were both subjects for Van Gogh's paintings. 
Van Gogh, introduced to etching by Gachet, made the etching "Portrait of Doctor Gachet" in 1890.
Gachet and Van Gogh discussed creating a series of southern France themes but that never happened.
This was the one and only etching, also known as "L'homme à la pipe" (Man with a pipe), that Van Gogh ever made.
Van Gogh's brother, Theo, who received an impression of the etching, called it "a true painter's etching.
No refinement in the execution, but a drawing on metal."
It is a different pose than that in Van Gogh's "Portrait of Dr. Gachet", owned by Musée d'Orsay.
The National Gallery of Canada finds that "The undulating flow of the line is typical of the expressive quality of Van Gogh's late style."
The impression owned by the National Gallery is from one of the 60 printings following Van Gogh's death by Dr. Gachet's son, Paul Gachet Jr. Gachet's collector's stamp appears on the bottom edge of the print. 
In 1890, Van Gogh's brother Theo was searching for a home for the artist upon his release from an asylum at Saint-Rémy.
Upon the recommendation of Camille Pissarro, a former patient of the doctor who told Theo of Gachet's interests in working with artists, Theo sent Vincent to Gachet's second home in Auvers.
Vincent van Gogh's first impression of Gachet was unfavorable.
Writing to Theo he remarked:"I think that we must not count on Dr. Gachet at all.
First of all, he is sicker than I am, I think, or shall we say just as much, so that's that.
Now when one blind man leads another blind man, don't they both fall into the ditch?
"However, in a letter dated two days later to their sister Wilhelmina, he relayed, "I have found a true friend in Dr. Gachet, something like another brother, so much do we resemble each other physically and also mentally."
Van Gogh's thoughts returned several times to the painting by Eugène Delacroix of Torquato Tasso in the madhouse.
After a visit with Paul Gauguin to Montpellier to see Alfred Bruyas's collection in the Musée Fabre, Van Gogh wrote to Theo, asking if he could find a copy of the lithograph after the painting.
Three and a half months earlier, he had been thinking of the painting as an example of the sort of portraits he wanted to paint: "But it would be more in harmony with what Eugène Delacroix attempted and brought off in his "Tasso in Prison", and many other pictures, representing a real man.
Ah!
portraiture, portraiture with the thought, the soul of the model in it, that is what I think must come.
"Van Gogh wrote to his brother in 1890 about the painting: 
The pastoral Auvers-sur-Oise region of hills, fields, gardens and cottages attracted artists to it and the surrounding area.
Starting in 1850 a railroad line facilitated travel from Auvers from Paris.
Artists who came to the area to paint included the Impressionists Armand Guillaumin, Camille Pissarro and Paul Cézanne.
In May 1890 Van Gogh left Saint-Rémy for Auvers where it provided a quieter life than that of Paris, but was still near his brother Theo for visits.
In Auvers he was under the care of Paul Gachet, a homeopathic physician, who advised Van Gogh to not worry about his illness and focus on his painting.
Gachet, an amateur painter, became a good friend.
To Theo he described Gachet as "something like another brother.
"In Van Gogh's first letter to his brother from Auvers he wrote, "It is profoundly beautiful, it is the real country, characteristic and picturesque."
Van Gogh is a 1991 film written and directed by Maurice Pialat.
It stars Jacques Dutronc in the role of Dutch painter Vincent van Gogh, for which he won the 1992 César Award for Best Actor.
Set in 1890, the film follows the last 67 days of Van Gogh's life and explores his relationships with his brother Theo, his physician Paul Gachet (most famous as the subject of Van Gogh's painting, "Portrait of Dr. Gachet"), and the women in his life, including Gachet's daughter, Marguerite.
The film was entered into the 1991 Cannes Film Festival.