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Beraha`s tint etch for iron and steels
Material: Beraha`s tint etch for iron and steels
Method: Chemical etching
Etchant (electrolyte): 3 g potassium metabisulfite, 10 g anhydrous, sodium thiosulfate, 100 ml water.
Procedure: Immerse 1-15 min.
Note: Colors ferrite, martensite, pearlite, and bainite: sulfides are brightened.
Source: This data accompanied an article written by George Vander Voort and originally appeared in the March, 1985 edition of Metal Progress "the monthly magazine of ASM International from 1930 to 1986.