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Copper - Brasses containing Si, Si bronzes - General macrostructure

Material Name: Copper
Recipe No.: 172
Primary Chemical Element in Material: Cu
Sample Type: Bulk
Uses: General macrostructure
Etchant Name: None
Type (Macro/Micro): Macro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 100 ml distilled water, 50 ml nitric acid, 8 ml sulfuric acid, 7.5 g ammonium chloride, 40 g chromium (VI) oxide.
Procedure (Condition): Few seconds to minutes. Toxic.
Note: Brasses containing Si, Si bronzes.
Reference: Fred Hargreaves (Ret.), Personal Etchants Database 1960-1990, Analytical Services Bookham Technology, Caswell, Towcester, Northamptonshire NN8EQ, UK.