Why was the invention of oil painting considered important to painters in the Renaissance?

The invention of oil painting during the Renaissance was significant for painters because it allowed for greater flexibility and detail in their work. Oil paints dry slowly, enabling artists to blend colors seamlessly and create richer textures and more realistic effects. This medium also facilitated the layering technique, which enhanced depth and luminosity in paintings. As a result, artists could achieve a level of realism and expression that was previously unattainable with earlier methods like tempera.