platinum blonde
US /ˌplæt.ɪ.nəm ˈblɑːnd/
UK /ˌplæt.ɪ.nəm ˈblɑːnd/

1.
a very light, silvery-blonde hair color, often achieved through bleaching
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She decided to dye her hair platinum blonde for a bold new look.
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Marilyn Monroe was famous for her iconic platinum blonde hair.