|This article does not cite any sources. (August 2007) (Learn how and when to remove this template message)|
A counterstain is a stain with colour contrasting to the principal stain, making the stained structure more easily visible.
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 Gram-negative bacteria as well. An alternative method uses dilute carbofluozide.
|This biology article is a stub. You can help Wikipedia by expanding it.|