The signature stamp of the certificate can be mounted or not, but the production style is different, and the actual effect and meaning are no different.

The personal seal of the outer frame is embossed, and the content of the seal is prominent. When printed, the content is red, also known as Zhu Wen. It's not that personal seals have frames, but that framed seals are used more. In addition, there are concave carvings without outer frames, and the contents of the seal are concave. When printed, the content is white, so it is also called Bai Wen.