Cosmetic application element

A cosmetic device comprising:

• a support comprising a water-soluble material;
• and
• a composition, carried by the support, for dyeing or bleaching hair, said composition for dyeing or bleaching the hair having a formulation that varies depending on a position on the support, so as to allow shaded dyeing or bleaching to be produced on the hair by transfer, the variation in the formulation of the composition for dyeing or bleaching the hair making it possible to obtain shaded dyeing or bleaching along a lock of treated hair in a length direction of the lock, comprising first and second regions that have between each other a colour difference in the Commission Internationale de l'Eclairage Lab (CIELab) colour space of greater than or equal to 1,
• wherein the support is configured to:
• vary colorimetric characteristics along a lock of treated hair when the support is brought into contact with the lock of hair, the varying being based on the variance in oxidizing and/or reducing power of the composition for dyeing or bleaching the hair along a longitudinal axis of the support, and/or
• vary a quantity of the composition for dyeing or bleaching the hair deposited linearly along the longitudinal axis of the support such that colorimetric characteristics along a lock of treated hair vary when the support is brought into contact with the lock of hair.

A cosmetic device comprising:

• a support comprising a water-soluble material, and
• a composition, carried by the support, for dyeing or bleaching hair, said composition for dyeing or bleaching the hair having a formulation that varies along a dimension of the support, so as to allow progressive shaded dyeing or bleaching to be produced along a lock of treated hair by transfer,
• wherein the support is configured to:
• vary colorimetric characteristics of a lock of treated hair when the support is brought into contact with the lock of treated hair, the varying based on a variance in the reducing power, oxidizing power and/or color of the composition for dyeing or bleaching the hair along a longitudinal axis of the support, and/or
• vary a quantity of the composition for dyeing or bleaching the hair deposited linearly along a longitudinal axis of the support such that colorimetric characteristics along the lock of treated hair vary when the support is brought into contact with the lock of hair.