The phrase "a deep stain" is correct and usable in written English.
It can be used to describe a significant or intense mark or discoloration on a surface, often referring to fabric or other materials.
Example: "After the party, I noticed a deep stain on the carpet that would require professional cleaning."
Alternatives: "a dark stain" or "a heavy stain".
Ceratocystis resinifera hyphae produce a black melanin pigment causing a deep stain in softwood logs.
The conduct of Toshiba's management and employees left a deep stain on Japan that threw corporate culture and corporate governance practices into turmoil.
To treat government employees -- or government contractors -- who leak classified information to the media in the public interest as foreign spies is a deep stain on our democracy.
One mayor said banning Syrians is as justified as what the United States did in World War 2, rounding up all Japanese Americans based exclusively on race and interring them in prison camps, an ugly tribal reaction born out of fear that left a deep stain on America's moral character.
Four- and eight-cell embryos showed a deep staining around the animal vegetal axis (fig. 4).
Four- and eight-cell embryos had a deep staining localized around the animal vegetal axis (fig. 4).
The landscape has changed now, and Tuesday's revelation, by ESPN, that more than 20 players could face 100-game suspensions is a deeper stain on the game.
In addition to the proportion of cells stained, the saturation of the stain is also measured, where a deeper stain indicates a greater intensity of the receptor.
Yet, thanks to the work of scholars, lawyers, artists and a handful of politicians, awareness of this deep stain on modern French history continues to grow.
One canvas has a deep oxblood stain and a gash shaped like a lightning bolt.
With a towel pressed to his skull in an attempt to contain the wound, Sirena hung limply over the side as a deep red stain spread over the aft quarter of Prada's silver hull.
