These are etchants recommended for copper alloys. The order of preference is from left to right.

Type of Copper: Etchant to Use:
Pure copper Copper etch
Cu-Ni Acidic ferric chloride
Copper alloys, brass, bronze Copper etch or Ferric chloride etchant
Macro-etching Copper Ferric chloride etchant

Copper Etch

• ASTM E407 formula 30, a popular general-purpose etchant for copper, brass, and bronze. It produces a nice flat etch for some copper alloys. This product has two parts. The user has to combine them before use. Use fresh.

Acidic Ferric Chloride

• ASTM E407 formula 34. Show the general structure of copper. It’s strong and effective. Immerse or swab a few seconds at a time. Repeat as necessary. Pre-mixed, ready to use.

Ferric Chloride Etchant

• A modified, milder version of Acidic Ferric Chloride. It’s a general-purpose micro/macro etching solution for copper and brass. Produces grain contrast. Pre-mixed, ready to use.

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