Staining specimen with heavy metal salts (e.g. tungsten, molybdenum) allows you to see the specimen better with higher contrast when electron beam deflects off of your sample.
Volume is the thing
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Its a Reflector
Reflector is some sort of material that is used to collect or bounce off energy such as sound, light, or radio wave
Usually it took form in some sort of parabolic that revolve around an axis
