abstract |
(A) a soluble salt containing at least a stannous salt, (B) an acid or a salt thereof selected from organic and inorganic acids, and (C) a phenyl-based polyoxyethylene bisphenol ether represented by the following general formula (1) It contains a surfactant and (D) a leveling agent. However, in formula (1), X is C a H 2a (a = 1 or 3), and m is 2 to 12. |