| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal surface etching processing method by which only a portion required to be confirmed can be surely observed.SOLUTION: Etching liquid-containing filter paper 13 to be a base material containing an etching liquid is stuck to an observation surface 12 of a metal test piece 11, and while rolling a roller 14 along the surface of the stuck etching liquid-containing filter paper 13, the etching liquid is uniformly applied to the observation surface 12 to form an etching observation surface. Consequently, only a portion required to be confirmed can be surely etched. |
