Etching of specimen is done to achieve
(a) visible grain boundary
(b) Invisible grain boundary
(c) toughness
(d) hardness
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visible grain boundary
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Since the grain boundaries are attacked at a greater rate than the proper grain due to higher energy content of the grain boundaries. ... Etching occurs when the acid or base is contacted with specimen surface because of the difference in rate of attack of the various phases present and their orientation.
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