Black and gray photosensitive pad is utilized in the creation of photosensitive seals. The seal’s composition content is first printed on transparent paper before being transferred onto the photosensitive pad material. Placed on the platform of the photosensitive machine, the seal manuscript and photosensitive material are exposed to light from the machine’s flash tube. The gray and black surface of the photosensitive material absorbs the light, converting it into heat which melts the surface to form a barrier film. The text content on the transparent paper acts as a shield, preventing the light and heat from melting the photosensitive material and preserving the character of the seal pattern. The photosensitive material that adheres to the text content retains the pattern and text, producing a film akin to silk screen printing and displaying the seal mode once ink is added.

The theory behind photosensitive seals involves printing the seal composition on transparent paper, attaching it to the photosensitive pad material, and subjecting it to the light of the photosensitive machine. The light exposure melts the surface of the photosensitive material, creating a barrier surface while the content on the transparent paper blocks certain areas from melting. This process results in the photosensitive seal pad retaining pores and oil leak, forming a unique pattern.

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