The image is a photograph of a sign on a wall that reads "Study of material". The sign is written in Chinese characters and is in a dark blue color. The text is written on a white background and is divided into two columns. 

The first column is titled "Study" and contains a list of materials, including Jade, which is a smooth and beautiful stone of the finest quality possessing a wide range of colors and shades, and can be subject to various influences from the environment of its natural materials. The second column is labeled "Jade" and lists the different types of materials and their properties.

At the bottom of the sign, there is a note that explains that Jade is a type of jade that is known for its ability to be used in various applications, such as jewelry, jewelry making, and jewelry making. The note also mentions that it is not only allowed to produce jade-like materials, but also to be mixed with other materials.