For centuries artists have painted oil-colour. There was nothing equivalent to this colour which resisted different temperatures, and the influence of light and age. The pictures kept their colour for years. It was only in the 1950s that the quality of acrylic colours reached such high standards that they could be used not only for painting walls but by artists as well. Still some artists prefer painting with oil-colour, because they are trained in it and don’t want to change.
The difference between acrylic colours and oil-colours are mainly two: 1. Oil-colours dry slowly, acrylics dry quickly. 2. You dilute oil-colours with a mixture of linseed oil and turpentine, you dilute acrylics with water.