Correction fluid for electrophoto plates for offset printing

Abstract From the Canadian patent

Disclosed is a correction fluid prepared by adding a stannous chelate compound having an acidic phosphate ester of an aliphatic alcohol as a ligand to an aqueous acidic solution. The correction liquid forms a hydrophilic stannous chelate compound precipitate, when the pH value of the liquid is elevated. Accordingly, where the correction liquid is coated on the unnecessary line image part of an electrostatic master paper plate and the pH value of the thus coated liquid is elevated, the unnecessary line image part of the plate is to be coated with the hydrophilic and water-insoluble stannous chelate compound so that it becomes insensitive to ink The operation for such correction may be …