Copper-sulfate can be used to test whether a ball is stainless steel or not. This solution consists of copper-sulfate crystals dissolved in a 6 percent solution of sulfuric-acid and water. A drop of this solution on the surface of a clean steel ball will immediately form a bright spot of copper plating. This solution will not affect any of the corrosive resistant materials within a two-minute period, but may react to hard ferritic or Martensitic stainless-steel after a long period of exposure.
|8g of copper sulfate||500 ml of distilled water||2-3 ml of sulfuric acid||dissolved together|
|6 minute soak||visual inspection||sample test steel ball and stainless steel balls|