07.01.16
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 yellowish brown color series and is selected from the group consisting of quercetin or a derivative thereof, an extract containing quercetin or the derivative thereof, and a mixture thereof. At least one of the at least two kinds of substances displays a color series other than the yellow or yellowish brown color series (a purple or purple-black color series, or a blue or blue-black color series).
Further, the patent states that at least one of the at least two kinds of substances displaying the color series other than the yellow or yellowish brown color series is selected from the group consisting of plant polyphenols, gardenia blue, cocoa pigment, purple sweet potato pigment, purple cabbage pigment or algae blue pigment.
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 yellowish brown color series and is selected from the group consisting of quercetin or a derivative thereof, an extract containing quercetin or the derivative thereof, and a mixture thereof. At least one of the at least two kinds of substances displays a color series other than the yellow or yellowish brown color series (a purple or purple-black color series, or a blue or blue-black color series).
Further, the patent states that at least one of the at least two kinds of substances displaying the color series other than the yellow or yellowish brown color series is selected from the group consisting of plant polyphenols, gardenia blue, cocoa pigment, purple sweet potato pigment, purple cabbage pigment or algae blue pigment.