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Wikipedia definition
1. CounterstainA counterstain is a stain with color contrasting to the principal stain, making the stained structure more easily visible. 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.
Read “Counterstain” on English Wikipedia
Read “対比染色” on Japanese Wikipedia
Read “Counterstain” on DBpedia

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