platinum blond

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A very light silver-blond hair color, especially when artificially produced.
• noun A person having hair of this color.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of a silvery blond colour (especially of hair).
• noun A silvery blond colour.
• noun rare A man having hair of this colour.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a blond whose hair is a pale silvery (often artificially colored) blond