How to use photographic sulfuric acid paper

Photographic sulfuric acid paper is used to filter the light source. If you want to take beautiful photos, you need a very soft light source. It is difficult for nature to get such a good light source. In order to get such a light source, you need an artificial light source to solve it.

Such as: flash. The light from the flash is very hard. If soft light is needed, sulfuric acid paper \ butter paper will be added in front of the flash to filter the light and make it soft. If one piece is not enough, two pieces are needed.