counterstain

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counterstain

[′kau̇nt·ər‚stān]
(biology)
A second stain applied to a biological specimen to color elements other than those demonstrated by the principal stain.
References in periodicals archive ?
Haematoxylin and Counterstains. Available at: http://www.adam.com.au/royellis/haem.html.
Harris Haematoxylin counterstains the epithelial nuclei as bluish purple.