Heavy color stick and oil painting stick are basically the same in color proportion, shape and color. The main difference is that the heavy color stick is soft and oily, so it is particularly easy to draw, easy to wipe, easy to draw gradual changes, and can draw more realistic works. The ordinary oil pastel is hard, only suitable for simple plane painting, not suitable for drawing gradient effect. Therefore, children we often see usually use ordinary oil pastels, and some children who draw realistic paintings use heavy-colored oil pastels.