Marble's Etchant
Marble's Reagent
Material Specific
Composition
10g CuSO₄, 50ml NH₄OH, 50ml H₂O
Mixed
Method
Immersion
Time
30s
Alternative Names
Tags
Reveals
Grain boundaries, twinning
Typical Results
For copper and brass. Reveals grain boundaries and twins.
Color Effects
Grain boundaries dark, twins visible
Compatible Materials
Incompatible Materials
Application Method
Method:immersion
Typical Time:30 seconds
Preparation Notes
Dissolve 10g CuSO₄ in 50ml water, then add 50ml NH₄OH.
Application Notes
Immerse sample for 30-60 seconds. Rinse with water.
Troubleshooting
Good for revealing annealing twins in copper.
Storage Notes
Store in glass bottle. Shelf life: several weeks.
Alternative Etchants
- Ammonium Persulfate
- CU-PASS-SOL
Similar Etchants
- Ammonium Persulfate