
1) Stain
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https://www.crosswordclues.com/clue/counterstain

An example is the malachite green counterstain to the fuchsine stain in the Gimenez staining technique. Another example is eosin counterstain to haematoxylin in the H&E stain. Also in Gram staining, crystal violet stains only Gram-positive bacteria, and safranin counterstain is applied which stains all cells, even allowing the identification of Gr...
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http://en.wikipedia.org/wiki/Counterstain

<technique> Rather non-specific stain used in conjunction with another histochemical reagent of greater specificity to provide contrast and reveal more of the general structure of the tissue. Light Green is used as a counterstain in the Mallory procedure, for example. ... (18 Nov 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

(koun´tәr-stān″) a stain applied to render the effects of another stain more discernible.
Found on
http://www.encyclo.co.uk/local/21001

Rather nonspecific stain used in conjunction with another histochemical reagent of greater specificity to provide contrast and reveal more of the general structure of the tissue. Light Green is used as a counterstain in the Mallory procedure, for example.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: kown′ter-stān Definitions: 1. A second stain of different color having affinity for tissues, cells, or parts of cells other than those taking the primary stain used to render more distinct the parts taking the first stain.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=20976

a secondary stain that adds contrasting color to cells from which the primary stain has been washed out by a decolorizing agent
Found on
https://courses.lumenlearning.com/microbiology/chapter/glossary/
noun a stain of contrasting color that is used when the principal stain does not show the structure clearly
Found on
https://www.encyclo.co.uk/local/20974

a second stain of a different color applied to a microscopic specimen and used to color and contrast those parts not retaining the first stain.
Found on
https://www.infoplease.com/dictionary/counterstain
No exact match found.