Final answer:
Oil painting technique was perfected by painters in Flanders during the Renaissance period.
Step-by-step explanation:
Painters perfected the technique of painting with an oil medium in Flanders. During the Renaissance period in the 15th century, Flemish painters like Jan van Eyck and Rogier van der Weyden pioneered the use of oil paint, creating highly detailed and realistic artworks. The advantages of using oil paint, such as its slow drying time and ability to create smooth and blended effects, made it a popular choice among artists.
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