Development of light-sensitive resin on metal with clear colour change - indicating state and course of process in precision printing

摘要

Process indicates the state and course of the development process by changing the colour of a metal substrate (I) coated with a layer of light-sensitive resin. The developer soln. (II) contains colour-change additive(s), causing a visible colour change in (I) within 60 s. (I) consists of Cu or Cu-coated material. (II) contains Na2S and opt. ammonium polysulphide (III) in water. USE/ADVANTAGE - The indication allows even inexperienced personnel to carry out development for precision printing under optimum conditions with the required ease. It gives a clear distinction between the exposed and unexposed areas, which facilitates fine work and retouching