Simple past tense and past participle of tone.(verb)
Having a (specified kind of) tone.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "toned" in a sentence
"Everett Collection Robert De Niro as Travis Bickle "I used the phrase 'toned the color down,'" Mr. Scorsese told an audience attending the "Taxi Driver" restoration unveiling at the DGA Theater last week."
"It always works for my curly hair mocha skin toned self!"
"The shouting matches at the town halls mimic the exact style of "discussion" she led and inspired during the campaign until McCain toned her down."