Method of permanent waving of hair in which the reMethod of permanent waving of hair in which the reducing or fixing composition contains a catalytic ducing or fixing composition contains a catalytic system comprising a manganese (II)or zinc (II) salsystem comprising a manganese (II)or zinc (II) salt and an alkali metal bicarbonate t and an alkali metal bicarbonate

Method of permanent waving of human hair comprises application of reducing composition to tensioned hair, rinsing, fixing by contact with air or with a fixing solution and re-rinsing, in which the reducing composition comprises aminated acid with thiol group and the reducing solution comprises a catalytic system of manganese and/or zinc salt and/or oxide and alkali metal bicarbonate. Method of permanent waving of human hair by applying a reducing composition to tensioned hair, rinsing, optionally removing the means of tensioning, fixing by contact with air or with a fixing solution and re-rinsing, in which the reducing composition comprises an aminated acid with a thiol group and the reducing or fixing solution comprises a catalytic system comprising a manganese and/or zinc salt and/or oxide and an alkali metal bicarbonate. The molar concentrations of Mn(II) and or Zn(II) salt or oxide and the alkali metal bicarbonate in the reducing and/or fixing compositions are such that (Mn(II)) or (Zn(II)) or (Mn(II)+Zn(II))/HCO3 is less than or equal to 1. Procédé de traitement des fibres kératiniques, en particulier des cheveux, en vue d'obtenir une déformation permanente de ces dernières, en particulier sous la forme de cheveux permanentés, comprenant l'application sur les fibres kératiniques à traiter une composition réductrice, le rinçage des fibres, la fixation des fibres et le rinçage (facultatif) des fibres, dans lequel : - la composition réductrice comprend une quantité effective d'au moins un acide aminé comportant au moins un groupe thiol, et;- l'une au moins des compositions réductrice et de fixation comprend un système catalytique d'au moins un sel et /ou oxyde de Mn (II) et/ou de Zn (II) et d'au moins un hydrogénocarbonate de métal alcalin.