0 present participle of blacken --
2 to spoil someone's reputation: --
Room temperature blackening for stainless steel occurs via auto-catalytic reaction of copper-selenide depositing on the stainless steel surface.
He also reported, among the old women, blackening the body with a kind of earth which gives a lustre like black lead.
It was suggested that the decomposition of organic matter (carbon) in the mineral was responsible for its blackening upon heating.
Though the floor of the container was damaged, there was no blackening or pitting of it.
When exposed to air, radium reacts violently with it, forming radium nitride, which causes blackening of this white metal.
The researchers did this by temporarily blackening the head colour of red males and mating them with red and black-headed females.
Also, during normal operation of such lamps, tungsten boils off the surface of the filament and condenses on the bulb glass, blackening it.
Tar also damages the mouth by rotting and blackening teeth, damaging gums, and desensitizing taste buds.
