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Iron, steel specimens, cast irons - Verification, arrangemnet, and distribution of Fe and Mn sulfide inclusions - Baumann's print

Material Name: Iron, steel specimens, cast irons
Recipe No.: 194
Primary Chemical Element in Material: Fe
Sample Type: Bulk
Uses: General macrostructure
Etchant Name: Baumann's print
Type (Macro/Micro): Macro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 100 ml distilled water, 5 ml sulfuric acid (Baumann print).
Procedure (Condition): Silver bromide paper is satured with solution, and firmly pressed against the prepared surface. After 1-5 min, rinse fic (6 g sodium thiosulfate in 100 ml water), wash and dry.
Note: Verification, arrangemnet, and distribution of Fe and Mn sulfide inclusions. Sulfide reacts with sulfuric acid, froming hydrogen sulfide which combines to darkish silver sulfide with the silver from the silver bromide in the photographic paper.
Reference: Fred Hargreaves (Ret.), Personal Etchants Database 1960-1990, Analytical Services Bookham Technology, Caswell, Towcester, Northamptonshire NN8EQ, UK.