Answer
It is a die.
Work Step by Step
The counterstain serves as a die, allowing for the viewer to see the non-acid-fat-cells, which can be hard to see using a microscope if the counterstain is not used.
Microbiology: An Introduction, 11th Edition
by Tortora, Gerard J.; Funke, Berdell R.; Case, Christine L.
Published by
Benjamin Cummings
ISBN 10:
0321733606
ISBN 13:
978-0-32173-360-3
Chapter 3 - Observing Microorganisms Through a Microscope - Study Questions - Review - Page 73: 7
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