Abstract: A method for determining a greyness level of a strand of hair and a system adapted to implement this method are provided. First, an image of the strand of hair representing it according to a predefined representation standard is obtained. The image comprises a portion representing the strand of hair with pixels. Then, for each pixel of the portion, a luminance value is determined. After that an amount of pixels in the portion for which the determined luminance value is above a threshold luminance value is determined. Finally, the greyness level of the strand of hair is determined by estimating a ratio of the determined amount of pixels over a total amount of pixels in the portion.

Abstract: An arrangement for determining a degree of stretching of hair is provided. The arrangement includes a detection unit for detecting hair characteristics and an evaluation unit for evaluating the detected hair characteristics and for determining the degree of elongation of hair based on the detected hair characteristics. The detection unit contains a near-infrared sensor, and is configured to irradiate a hair sample with electromagnetic waves in the infrared range and to detect an absorbance of the hair sample in a wavelength range from about 800 to about 2500 nm. The acquisition unit is configured to generate an absorption spectrum of the hair sample in the wavelength range of from about 800 to about 2500 nm and provide it to the evaluation unit and the evaluation unit is configured to compare the generated absorption spectrum with a calibration model and to determine a degree of elongation of the hair sample.

Abstract: A method for determination of a cross-manufacturer hair coloration agent recommendation is provide. The method includes the allocation of a number of hair coloration agents to respectively one standard source hair color of a number of source hair colors, a coloration of hair samples with the number of hair coloration agents, a colorimetric measurement of the number of hair samples, a determination of a color difference between each of the number of colors, an allocation of each of the hair coloration agents with unknown composition to one of the hair coloration agents with known composition in such a way that the color difference is minimized, a determination of the user source hair color, a determination of the user's desired hair color, a determination of a first recommended hair coloration agent from the number of hair coloration agents of known composition and of a second recommended hair coloration agent.

Abstract: A method for determining a greyness level of a strand of hair and a system adapted to implement this method are provided. First, an image of the strand of hair representing it according to a predefined representation standard is obtained. The image comprises a portion representing the strand of hair with pixels. Then, for each pixel of the portion, a luminance value is determined. After that an amount of pixels in the portion for which the determined luminance value is above a threshold luminance value is determined. Finally, the greyness level of the strand of hair is determined by estimating a ratio of the determined amount of pixels over a total amount of pixels in the portion.

Abstract: A method for determining a coloration product recommendation, in particular a hair coloration product recommendation. First images representing an object colored using a coloration product are obtained. A color of the colored object is identified on the images by determining a global color value taking into account different elements within the image. Then a desired color is obtained. A recommendation for a coloration product to achieve the desired color is determined. The recommended coloration product corresponds to the product which keeps the color difference between the desired color and the identified color below a predetermined threshold.

Abstract: A method for determination of a cross-manufacturer hair coloration agent recommendation is provide. The method includes the allocation of a number of hair coloration agents to respectively one standard source hair color of a number of source hair colors, a coloration of hair samples with the number of hair coloration agents, a colorimetric measurement of the number of hair samples, a determination of a color difference between each of the number of colors, an allocation of each of the hair coloration agents with unknown composition to one of the hair coloration agents with known composition in such a way that the color difference is minimized, a determination of the user source hair color, a determination of the user's desired hair color, a determination of a first recommended hair coloration agent from the number of hair coloration agents of known composition and of a second recommended hair coloration agent.

Abstract: A method for determining a correspondence between hair coloring agents and hair coloring results is provided. The method includes obtaining hair color data. Further, the method includes splitting hair color data into a first hair color group and a second hair color group, the first hair color group comprising more data than the second hair color group. The method also includes adding artificial hair color data to the second hair color group. The method further includes building a model by employing predictive analytics based on the hair color data and including the artificial hair color data.

Abstract: An arrangement to determine a reductive damage of hair is provided. The arrangement contains a detection unit for detecting hair features and an evaluation unit for evaluating the detected hair features and for determining the reductive damage of hair based on the detected hair features. The detection unit contains a near infrared sensor, and is configured to irradiate a hair sample with electromagnetic waves in the near infrared range at a wavelength from about 800 to about 2500 nm and to detect the light emitted by the hair sample. The detection unit is configured to generate a spectrum of the emitted light and provide it to the evaluation unit and the evaluation unit is configured to determine a reductive damage based on the spectrum of the emitted light in a wavelength range from about 1970 to about 1980 nm.

Abstract: An arrangement for determining a degree of stretching of hair is provided. The arrangement includes a detection unit for detecting hair characteristics and an evaluation unit for evaluating the detected hair characteristics and for determining the degree of elongation of hair based on the detected hair characteristics. The detection unit contains a near-infrared sensor, and is configured to irradiate a hair sample with electromagnetic waves in the infrared range and to detect an absorbance of the hair sample in a wavelength range from about 800 to about 2500 nm. The acquisition unit is configured to generate an absorption spectrum of the hair sample in the wavelength range of from about 800 to about 2500 nm and provide it to the evaluation unit and the evaluation unit is configured to compare the generated absorption spectrum with a calibration model and to determine a degree of elongation of the hair sample.

Abstract: Devices and methods for determining the thickness of hair are provided. An exemplary device includes a computing unit with a processor and a local memory. The processor is connected to the local memory and configured to read data from and/or to write data into the local memory. The device further includes a user input/output unit configured for interaction with a user. Also, the computing unit includes an image data input interface for receiving image data of at least one individual hair. The image data input interface is connected to the processor. Further, the computing unit includes a user interface connected to the user input/output unit and to the processor. The computing unit is configured to process the image data of the at least one individual hair to create hair thickness values of the at least one individual hair and to output the hair thickness values to the user interface.

Abstract: The present disclosure relates to an agent (A) for changing the colour of keratin fibres, in particular human hair, which agent comprises unilamellar vesicles (ULV) and/or multilamellar vesicles (MLV) in an aqueous medium, wherein the agent contains at least one C8-C30 fatty alcohol (a1), at least one ethoxylated fatty alcohol (a2), at least one anionic surfactant of the type of (optionally ethoxylated) fatty alcohol sulfates (a3), and one or more colour-changing salts (a4) from the group of sulfates, hydrogen sulfates, chlorides, and/or bromides in a total amount of from about 0.3 to about 6.0% by weight. The present disclosure further relates to a multi-component packaging unit, in which the aforementioned agent (A) is formulated separate from an oxidant preparation (B). The present disclosure further relates to a method for producing the agent (A).

Abstract: A composition for dyeing keratinous fibres comprises, in an aqueous carrier, (a) highly ethoxylated C16-C18 fatty alcohol(s) with from about 30 to about 100 ethoxy groups, (b) low-ethoxylated C16-C18 fatty alcohol(s) with 1 to 5 ethoxy groups, (c) optionally monoester(s) of glycerol and a C14-C20 fatty acid, (d) C16-C18 fatty alcohol(s), (e) alkalising agent(s), and (f) oxidation dye precursor(s), wherein—the weight ratio of all highly ethoxylated C16-C18 fatty alcohols (a) to all low-ethoxylated C16-C18 fatty alcohols (b) is from about 10 to about 20, and the weight ratio of the sum of all constituents [(c)+(d)] to the sum of all ethoxylated fatty alcohols [(a)+(b)] is from about 2 to about 5. The present disclosure further relates to a multi-component packaging unit, in which the aforementioned composition is packaged separately from an oxidant preparation.

Abstract: Oxidative compositions for oxidative treatment of hair, kits including such compositions, and methods for oxidative color change are provided. An exemplary oxidative composition includes comprises water, hydrogen peroxide, at least linear saturated 1-alkanol with from about 12 to about 30 carbon atoms, at least one anionic surfactant selected from alkyl sulfates and alkyl ether sulfates, dipicolinic acid, 1-hydroxyethane-1,1-diphosphonic acid, disodium pyrophosphate, benzoic acid or a salt thereof, and potassium hydroxide. The exemplary oxidative composition has a pH in the range of from about 2 to about 3.8, each measured at 20° C. The exemplary oxidative composition includes no phosphoric acid, no salicylic acid, no diethylenetriamine pentaacetic acid, no ethylenediamine tetraacetic acid, no nitrilotriacetic acid nor salts thereof, and no phenacetin, no stannates, no cationic surfactants and no oil.

Abstract: Devices and methods for determining the thickness of hair are provided. An exemplary device includes a computing unit with a processor and a local memory. The processor is connected to the local memory and configured to read data from and/or to write data into the local memory. The device further includes a user input/output unit configured for interaction with a user. Also, the computing unit includes an image data input interface for receiving image data of at least one individual hair. The image data input interface is connected to the processor. Further, the computing unit includes a user interface connected to the user input/output unit and to the processor. The computing unit is configured to process the image data of the at least one individual hair to create hair thickness values of the at least one individual hair and to output the hair thickness values to the user interface.

Abstract: The present disclosure relates to an agent (A) for changing the colour of keratin fibres, in particular human hair, which agent comprises unilamellar vesicles (ULV) and/or multilamellar vesicles (MLV) in an aqueous medium, wherein the agent contains at least one C8-C30 fatty alcohol (a1), at least one ethoxylated fatty alcohol (a2), at least one anionic surfactant of the type of (optionally ethoxylated) fatty alcohol sulfates (a3), and one or more colour-changing salts (a4) from the group of sulfates, hydrogen sulfates, chlorides, and/or bromides in a total amount of from about 0.3 to about 6.0% by weight. The present disclosure further relates to a multi-component packaging unit, in which the aforementioned agent (A) is formulated separate from an oxidant preparation (B). The present disclosure further relates to a method for producing the agent (A).

Abstract: Aqueous hydrogen peroxide preparations containing selected 1-alkanols in a total amount of from about 1 to about 2.8 wt %, selected anionic surfactants in a total amount of from about 0.05 to about 0.5 wt %, additionally dipicolinic acid, 1-hydroxyethane-1,1-diphosphonic acid, disodium pyrophosphate, benzoic acid and potassium hydroxide in selected amounts can be adjusted to be stable in storage at a pH in the range of from about 2 to about 3.8 (about 20° C.) without adding any additional stabilizers.