When we do oil painting, it is inevitable to encounter such and such problems, at this time, do not think that you can't go on and give up, use some methods can improve the problem, and even make the sense of painting better. For example, in the progression stage of a painting, too much paint is used to cause the surface of the painting to accumulate, and the newly added paint and the original underneath will be dirty and unsightly.

This is done by using an absorbent piece of paper, such as newspaper or kitchen paper, on an area with too much paint or the entire picture, gently rubbing it with the palm of your hand and carefully removing it. This method removes excess paint from the top layer of the picture, giving the picture a thin initial and softer contours, which provides an ideal base for the next work.
Tangkfa was very useful in the painting of portraiture, as it was able to remove details while leaving large structures of the head frame. Often, the slightest misalignment of facial details, especially the eyes and mouth, can ruin the similarity of the entire portrait to the subject. In order to make them as accurate as possible, you will repeatedly depict them layer after layer and accumulate too much paint. Sometimes the Tonk method can be used to facilitate the completion of the painting, and you only need to add a little more touching, or even no changes at all.
1. The picture has the common problem of excessive pigment accumulation. Obviously, to this degree of thick coating, the picture needs to be further depicted.
2. Carefully cover the left picture with newspaper or other absorbent paper to implement the Tonk method, and rub it smoothly with the palm of your hand to ensure that the top layer of pigment can be adsorbed by the paper. Then slowly peel off the paper with the sticking paint.
3. After the completion of the Tonk method, only a thin layer of paint remained on the oil picture, and the brushstrokes and details were removed from the ideal surface for further depiction. You can use the Tonkfa whenever you like throughout the creative process.