US20250262138
2025-08-21
Human necessities
A61K8/49
The disclosed hair dye composition features a tunable system that utilizes photochromic dyes to achieve multiple color changes with a single application. The composition includes at least two photochromic dyes, each activated and deactivated by specific electromagnetic radiation (EMR). Prior to activation, these dyes are typically colorless, allowing users to apply the dye without immediate color change. By adjusting the fluence of the activating and deactivating EMR, users can customize the intensity or shade of the resulting hair color, offering a versatile range of colors from one product.
This innovation pertains to hair dye compositions that allow users to alter hair color using energy sources. Specifically, it involves compositions containing multiple photochromic dyes designed to provide various hair color transformations upon exposure to EMR. This approach addresses the limitations of traditional hair dyes that require separate products for different colors and can be inconvenient for users seeking temporary changes.
Traditional hair dyes often involve chemical treatments that offer limited flexibility in changing colors. These methods can be time-consuming and may require waiting for colors to fade or grow out. Earlier attempts with photochromic dyes provided some flexibility but were restricted to single color changes and required continuous EMR application. Additionally, suitable solvents for such dyes in cosmetic applications were lacking, as many were not safe for use on skin and hair.
The new composition comprises two distinct photochromic dyes, each responsive to different EMR wavelengths for activation and deactivation. This allows for sequential color changes without needing separate dye applications. The method involves applying the dye composition to hair and using EMR within specific wavelength ranges (250-395 nm for activation and 400-700 nm for deactivation) to achieve desired color outcomes. The inclusion of safe solvents suitable for human use enhances the practicality of this approach.
The innovation overcomes previous limitations by combining different photochromic compounds that enable multiple color changes with a single application. Safe solvents previously unconsidered, like certain botanical oils, are identified as effective carriers for these dyes. The invention allows users to switch between colors by varying EMR wavelengths or fluence, offering a customizable experience without harsh chemicals. The flexibility in formulation allows for various embodiments and combinations, ensuring user safety and satisfaction.