earticle

영어

For the development of colored-proto grapby, the silver dye blech processes were extensively studied. For the first time, the developed silver was main catalyst, but recently active organic compounds are widely used as organic catalyst. They were guinoxaline and phenazine derivatives and it may forrned protonated free radical() under the presence of strong acid. Herewith the chemical reaction involved those catalyst and it's kinetic theory were described. Also, properties of the product with organic catalyst and improved process was reviewed.