Relief Printing ⚫ Plate Production. Modern relief printing plates are made from rubber, photopolymer or occasionally metal, depending on the application. Plates are modest in cost and can be made quickly. Nearly all are made by photographically imposing the image recorded on a photonegative onto a light-sensitive material. In the case of photopolymers, the polymer hardens where exposed to ultraviolet (UV) light and remains fluid where unexposed. The unexposed part is then dissolved away. (See Figure 11.1)Relief Printing ⚫ Plate Production. Modern relief printing plates are made from rubber, photopolymer or occasionally metal, depending on the application. Plates are modest in cost and can be made quickly. Nearly all are made by photographically imposing the image recorded on a photonegative onto a light-sensitive material. In the case of photopolymers, the polymer hardens where exposed to ultraviolet (UV) light and remains fluid where unexposed. The unexposed part is then dissolved away. (See Figure 11.1)