An etchant was used to electively etch the grain boundaries. Mention whether these grain boundaries would appear brighter or darker after etching when observed through optical microscope and explain the reason for such appearance.

It gets darker after etching when observed through optical microscope.

Explanation:

This question deals with the study of the structures of different kinds of metallic alloys in a micro way that is to say METALLOGRAPHY.

So, ETCHING in METALLOGRAPHY simply means the application of chemical substance to show the microstructure of a metallic alloy.

What one will observe through optical microscope when grain boundaries are etched is that there will be darker appearance because a lot of light is scattered which in turn will give a darker appearance of the grain boundaries.

sorry what a asnns

explanation:

answer:

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