Colouring composition, method for obtaining and using same for colouring skin and/or keratin matters. The composition comprises, in a physiologically acceptable medium, an efficient amount of at least one colouring agent precursor selected among the compounds comprising at least one aromatic cycle having at least two hydroxyl groups carried by two consecutive carbon atoms of the aromatic cycle, optionally an amino acid comprising at least one thiol group and an efficient amount of a catalytic sy...

A composition for coloring keratin fibers comprises, a physiologically acceptable medium and an efficacious quantity of at least one coloring material precursor selected from the compounds containing at least one aromatic ring having at least two hydroxyl groups borne by two adjacent carbon atoms of the aromatic ring, an efficacious quantity of at least one oxidation base of the para or ortho type selected from the aromatic amines, and an efficacious quantity of a catalytic system comprising a f...

A method of performing a beauty analysis is disclosed. The method comprises receiving information of at least one portion of a subject's external body condition, identifying in the information at least one condition, extracting from the information at least one feature of the at least one condition, and storing extracted information reflective of the at least one feature.

Described is a method of reducing transcutaneous passage of an orthodiphenol oxidation dye by adding a catalytic system of Mn(II) or Zn(II) salt or oxide and at least one alkaline or alkaline earth hydrogenocarbonate to the orthodiphenol oxidation dye composition.

A method, device and system for determining skin type. The method includes a step of applying at least one drop of substance onto a zone of the skin or on a collector member previously in contact with the zone of the skin. The substance can modify at least one physicochemical property of the surface of the zone or of the collector member exposed to the substance. After the drop has disappeared or been removed, the extent of the surface is evaluated and the skin type is determined as a function o...

Described is a method of reducing transcutaneous passage of an orthodiphenol oxidation dye by adding a catalytic system of Mn(II) or Zn(II) salt or oxide and at least one alkaline or alkaline earth hydrogenocarbonate to the orthodiphenol oxidation dye composition.

The present invention includes a method for predicting evolution of at least one condition of an external body portion of a subject. The method may include receiving first data, receiving second data, generating a forecasted or expected evolution of the at least one condition of the external body portion of the subject based on the first data and the second data, and transmitting to the subject the forecasted evolution. The first data may be representative of at least one condition of the extern...

Pigmentation of human skin and/or hair is promoted by administering to individuals in need of such treatment, advantageously topically, an effective tyrosinase activity-stimulating amount of at least one 6-substituted pyrimidine 3-oxide having the structural formula (I): ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, are each a hydrogen atom or a C.sub.1 -C.sub.12 alkyl radical; and R.sub.3 and R.sub.4, which may be identical or different, are each a C.sub.1 -C.sub.1...

Method for diagnosing a cellular aging or inflammation condition of keratinocytes of the skin or a pilous follicle in a person, or for diagnosing the efficiency of a treatment intended to combat said condition. To this effect, the concentration or activity of certain markers (catalase, glutathion or glutathion peroxydase) is compared in the keratinocytes suspected of being pathological and the keratinocytes of a reference non pathological area. The pathological condition intensifies the activity...

The invention relates to the use of hydroxystilbenes for dyeing, to ready-to-use dye compositions comprising them, to a dyeing process using them and to a multi-compartment device containing the compositions used in the processes of the invention.