SelectaColor and Pyrofoto are called “photo-resists”. What exactly is a photo-resist and how does it differ from conventional print-making techniques like photographic emulsion?
Photo-resist is basically a process where an image is exposed through a transparency, and after exposing, is “washed out,” leaving behind just the exposed areas. It is used extensively in printing. Some photo-resists are washed out after exposure with special solvents and others, like SelectaColor, with plain water. The parts of the image that have been exposed to light are hardened, while the unexposed areas are water-soluble and disappear down the drain. If everything washes off, the resist has been under-exposed. If no parts wash off, it is overexposed. By their nature, photo-resists are capable of a wide range of effects depending on what they are made of. In pigmented SelectaColor, the resist consists of finely dispersed pigments that are solid particles of color and after wash-out make an extremely bright and durable image. By substituting ceramic stains for pigments in clear SelectaColor, images can be fired on glass and ceramics. By contrast, photographic emulsions form a conti
Related Questions
- SelectaColor and Pyrofoto are called "photo-resists". What exactly is a photo-resist and how does it differ from conventional print-making techniques like photographic emulsion?
- Why are SelectaColor, Pyrofoto and classic processes often called "room light" processes?
- Why are SelectaColor and Pyrofoto often called "room light" processes?
