Aqua Regia

material specific

Composition

75ml HCl, 25ml HNO₃

Mixed

Method

immersion

Time

30s

Basic Information

Category:Material Specific

Composition:75ml HCl, 25ml HNO₃

Concentration:Mixed

Reveals:Grain boundaries, phases, carbides

Typical Results:Very aggressive etchant for noble metals and some stainless steels. Excellent for revealing grain structure in difficult-to-etch materials.

Color Effects:Grain boundaries dark, phases visible