According to Lauder inventors, reducing the appearance of dark under-eye circles has proven difficult. Typical color cosmetic formulas contain metal oxide pigments, dyes and/or lakes, mica, peptides, etc., to mask dark circles but these tend to look unnatural.
The use of light scattering with fluorescent emissions is also known, based on optically activated particles. These particles comprise a solid nylon substrate within which a synthetic fluorescent compound coated with cross-linked polyvinyl alcohol (PVA) is embedded.
Such particles emit and diffuse visible blue light to illuminate shadows and/or camouflage fine lines, creating the illusion that such imperfections do not exist. However, there remains a need for natural looking compositions that reduce the appearance of dark under-eye circles. The present invention invention addresses this need—specifically, by stabilizing riboflavin.
Stabilized riboflavin to mask under-eye circles
U.S. Patent 10030022
Publication date: July 24, 2018
Assignee: ELC Management LLC
Disclosed in this patent is a method to stabilize riboflavin by affixing it to at least one substrate by covalent bonding, hydrogen bonding, Van der Waals forces or a combination thereof to form an optically activated complex. When it absorbs light in the visible to UV range, the riboflavin in the complex re-emits light of longer wavelength in the blue-green-yellow region of the electromagnetic spectrum.
By harnessing ambient light and concentrating the increased light reflection in the area of the skin imperfections, especially dark under-eye circles, the invention is said to obscure discoloration and uneven surface textures, imparting a perception of natural, smooth and even-toned skin.
Patent accessed on Aug. 3, 2018.