Glycerol-HCl-HNO₃
Glyceregia
Material Specific
Composition
15ml HCl, 10ml HNO₃, 10ml Glycerol
Mixed
Method
Immersion
Time
20s
Alternative Names
Tags
Reveals
Grain boundaries, phases, carbides
Typical Results
Excellent for austenitic stainless steels and nickel alloys. Reveals grain structure clearly.
Color Effects
Grain boundaries dark
Compatible Materials
Incompatible Materials
Application Method
Method:immersion
Typical Time:20 seconds
Preparation Notes
Mix 15ml HCl, 10ml HNO₃, and 10ml glycerol. Add acids to glycerol slowly. CAUTION: Exothermic reaction.
Application Notes
Immerse sample for 20-40 seconds. Swab gently. Rinse immediately with water and ethanol.
Troubleshooting
Prepare fresh for best results. Glycerol slows reaction rate. Use fume hood.
Storage Notes
Store in glass bottle. Prepare fresh when needed. Shelf life: 1-2 weeks.
Alternative Etchants
- Kalling's No. 2
- Aqua Regia
Similar Etchants
- Aqua Regia