abstract |
(57) [Summary] [PROBLEMS] To provide an etching solution capable of removing an unmodified epoxy resin without using concentrated sulfuric acid, chromic acid, or alkali permanganate. [PROBLEMS] To provide an etching solution comprising an amide-based solvent and an alcohol-based solvent solution of an alkali metal compound capable of etching a cured product of a specific thermosetting epoxy resin composition. |