Process for producing transparent conductive layer forming coating liquid

A process for producing a transparent conductive layer forming coating liquid;

• the process comprising a noble-metal-coated fine silver particle making step of adding to a colloidal dispersion of fine silver particles i) a reducing agent and at least one of an alkali metal aurate solution and an alkali metal platinate solution or ii) a reducing agent and a solution of mixture of an alkali metal aurate and an alkali metal platinate to obtain a colloidal dispersion of noble-metal-coated fine silver particles the particle surfaces of which have been coated with gold or platinum alone or a composite of gold and platinum, wherein;
• a cation exchanger is added to said colloidal dispersion of fine silver particles before, or at the same time of, the addition of said reducing agent and any of said alkali metal aurate solution, said alkali metal platinate solution and said solution of mixture of an alkali metal aurate and an alkali metal platinate;
• and
• said colloidal dispersion of noble-metal-coated fine silver particles is obtained while any impurity ions formed as a result of reduction are removed through the cation exchanger.