US Patent 7452528 - Peptide-CNT hair colorant

http://www.freepatentsonline.com/7452528.html

This patent from DuPont identifies another use of carbon nanotubes as a component of hair colorant which offers the advantage of a more long-lasting black pigment. Claim 1 reads:

1. A diblock, peptide-based carbon nanotube hair colorant having the general structure (HBP)n-CNT, wherein

a) HBP is a hair-binding peptide;

b) CNT is a carbon nanotube; and

c) n ranges from 1 to about 500.