| abstract |
(57) [Summary] (Modifications) [PROBLEMS] To provide a metal colloid liquid which can obtain high dispersibility by a simple production method and exhibit high conductivity. A metal colloid solution containing at least one compound selected from the group consisting of polyene polycarboxylic acids, derivatives at carboxyl groups, and salts thereof. Preferably, the polyene polycarboxylic acid is a compound represented by the general formula (1). [In the formula, n is an integer of 0 to 5, m is an integer of 1 or 2. However, when n is 0, m is 1. ] A method for producing a metal colloid liquid by reducing a metal salt with a reducing agent, wherein the reducing agent is tannic acid. |