answers: the late 15th century
context: North, starting in Venice in the late 15th century. By 1540, the previous method for painting on panel (tempera) had become all but extinct, although Italians continued to use chalk-based fresco for wall paintings, which was less successful and durable in damper northern climates. The linseed oil itself comes from the flax seed, a common fiber crop. Linen, a "support" for oil painting (see relevant section), also comes from the flax plant. Safflower oil or the walnut or poppyseed oil are sometimes used in formulating lighter colors like white because they "yellow" less on drying than linseed oil, but they </s> still panel paintings on wood, but around the end of the 15th century canvas became more popular as the support, as it was cheaper, easier to transport, allowed larger works, and did not require complicated preliminary layers of gesso (a fine type of plaster). Venice, where sail-canvas was easily available, was a leader in the move to canvas. Small cabinet paintings were also made on metal, especially copper plates. These supports were more expensive but very firm, allowing intricately fine detail. Often printing plates from printmaking were reused for this purpose. The popularity of oil spread through Italy from the </s> Indian art, Chinese art, and Japanese art each had significant influence on Western art, and vice versa. Initially serving utilitarian purpose, followed by imperial, private, civic, and religious patronage, Eastern and Western painting later found audiences in the aristocracy and the middle class. From the Modern era, the Middle Ages through the Renaissance painters worked for the church and a wealthy aristocracy. Beginning with the Baroque era artists received private commissions from a more educated and prosperous middle class. Finally in the West the idea of "art for art's sake" began to find expression in the work of the Romantic
question: oil painting has been the medium of choice for painter since