US Patent No. 9,345,654 B2; The Natural Medicine Institute of Zhejiang Yangshengtang, Hangzhou, has been awarded a US patent for dying human or animal hair. It is comprised of an effective amount of natural dye substances; and optionally one or more excipients. The natural dye substance comprises at least two kinds of substances and displays at least two color series. The new color is produced by a superposition of at least two color series. At least one of the substances displays a yellow or...