Conversion solutions for planographic masters

摘要

A conversion solution for rendering hydrophilic the zinc oxide resin binder type planographic masters containing 2.0% potassium ferrocyanide, phosphoric acid to produce a pH in the range of 4.1 - 4.2 and a buffering salt of ammonium acid phosphate or sodium acid phosphate to buffer the solution and 4.0% by weight of triethanolamine as a modifying and solvating agent to raise the solubility threshold preventing formation of needle-like crystals that tend to form as water evaporates from the solution, and modify the physical property of crystals that do form to a less-hard structure.