You searched for: “twinge
tinge, twinge
tinge (TINJ) (verb)
To change or modify to a slight degree typically in reference to color: "The artist decided to tinge the sunset in the painting with a slight pink color."
twinge (TWINJ) (noun)
A sharp localized pain which may be either physical or moral: "The man felt a twinge in his ankle when he was walking because he had twisted it earlier in the day."

"He seemed to experience a mental twinge of conscience when he realized what he had done."

The artist didn't seem to have a twinge of conscience when she decided to tinge the original painting of the sunset by adding a hint of orange.