Why is there a bright spot when shooting with light-absorbing cloth?

The light spot is caused by the reflection of floating dust in the air.

1, the function of black cloth is because it "absorbs light".

We usually see the color of an object because it reflects the color in the light, so the color of the object we are talking about is actually the color of the color it reflects.

3, a black object, it absorbs all the colors that the light source shines on it, and it becomes black;

4. In order to control the illumination on both sides of the subject in the studio, black cloth should be hung on both sides.

5. In case of stray light or redundant anti-S light on the subject, record it in the image.

6, the best light-absorbing cloth is black velvet, which has the strongest light-absorbing ability, of course, the price is slightly higher.