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Aqua Regia - Austenitic stainless steels - Chemical etching

Material Name: Austenitic stainless steels
Recipe No.: 11383
Primary Chemical Element in Material: Fe
Sample Type: Bulk
Uses: General microstructure
Etchant Name: Aqua Regia
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 15 ml HCl, 5 ml HNO3.
Procedure (Condition): Use fresh. Use at 20 Celsius for about 5 seconds. Do not store.
Note: For etching austenitic stainless steels. Attacks siga, outlines carbides. After 20 seconds siga completely dissolved. Reveals grain boundaries.
Reference: G. Vander Voort, Metallography Principles and Practice; McGraw-Hill, New York (1984), p. 649.