Information:  - Vincent Willem van Gogh (30 March 185329 July 1890) was a Dutch Post-Impressionist painter who is among the most famous and influential figures in the history of Western art. In just over a decade he created about 2,100 artworks, including around 860 oil paintings, most of them in the last two years of his life. They include landscapes, still lifes, portraits and self-portraits, and are characterised by bold colours and dramatic, impulsive and expressive brushwork that contributed to the foundations of modern art. His suicide at 37 followed years of mental illness and poverty.  - Irises is one of many paintings and prints of irises by the Dutch artist Vincent van Gogh . Irises was painted while Vincent van Gogh was living at the asylum at Saint Paul - de - Mausole in Saint - Rémy - de - Provence , France , in the last year before his death in 1890 . It was painted before his first attack at the asylum . There is a lack of the high tension which is seen in his later works . He called the painting `` the lightning conductor for my illness '' because he felt that he could keep himself from going insane by continuing to paint . The painting was influenced by Japanese ukiyo - e woodblock prints like many of his works and those by other artists of the time . The similarities occur with strong outlines , unusual angles , including close - up views , and also flattish local colour ( not modelled according to the fall of light ) . He considered this painting a study which is probably why there are no known drawings for it , although Theo , Van Gogh 's brother , thought better of it and quickly submitted it to the annual exhibition of the Société des Artistes Indépendants in September 1889 , together with Starry Night Over the Rhone . He wrote to Vincent of the exhibition : `` ( It ) strikes the eye from afar . The Irises are a beautiful study full of air and life . ''  - Oil painting is the process of painting with pigments with a medium of drying oil as the binder. Commonly used drying oils include linseed oil, poppy seed oil, walnut oil, and safflower oil. The choice of oil imparts a range of properties to the oil paint, such as the amount of yellowing or drying time. Certain differences, depending on the oil, are also visible in the sheen of the paints. An artist might use several different oils in the same painting depending on specific pigments and effects desired. The paints themselves also develop a particular consistency depending on the medium. The oil may be boiled with a resin, such as pine resin or frankincense, to create a varnish prized for its body and gloss.    What entity does 'irises ' has the relation 'material used' with?
Answer:
oil paint