Hair dyeing method using natural dyes and metal salt

US12290584B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Lusine Sargsyan · Hamburg, DE
• Hartmut Manneck · Klein Wesenberg, DE
• Thomas Hippe · Appen, DE
• Volkmar Vill · Hamburg, DE

Key dates

• Filing date: Oct 5, 2021
• Grant date: May 6, 2025
• Expiry date: Nov 21, 2041

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q5/065
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present disclosure relates to a process and a kit for dyeing keratin-containing fibers, in particular human hair, using selected natural dyes and an iron(II) salt. The kit includes an aqueous composition (M) and an aqueous composition (T), where the aqueous composition (M) includes a polyphenol and a buffer system. The aqueous composition (T) includes a salt of the divalent iron cation Fe(II), and optionally includes a buffer.