Abstract: The present invention relates to a process for curling keratin fibres, such as the hair, which comprises at least the rolling of said fibres around one or more curling means, the application of a reductive acidic cosmetic composition, and a step of heating said fibres. The invention also relates to the use of said cosmetic composition for curling keratin fibres which have been dyed and/or lightened beforehand.

Abstract: Process for treating keratin fibres using at least one sulfureous reducing agent, at least one cationic polymer and at least one mercaptosiloxane The present invention relates to a process for treating keratin fibres, in particular human keratin fibres such as the hair, comprising a step of applying to the keratin fibres a reducing composition (A) comprising one or more sulfureous reducing agents, optionally a step of applying to the keratin fibres an oxidizing composition (B), a step of applying a rinse-out or leave-in care composition (C), comprising one or more cationic polymers and optionally one or more amino silicones (i), it being understood that the reducing composition (A) and/or the oxidizing composition (B) and/or composition (C) comprise(s) one or more silicones (ii), other than the silicones (i), with a molecular weight of less than 10 000 and functionalized with one or more mercapto groups.