The present invention relates to hair colouring and bleaching compositions
comprising i) at least one source of peroxymonocarbonate ions, ii) at
least one alkalizing agent, preferably a source of ammonium ions, and
iii) at least one radical scavenger, wherein said composition has a pH of
up to 9.5, which provide a high level of lift and lightening and the
required dye deposition and grey coverage whilst reducing the
concentration of peroxide, the ammonia odour and reducing the hair fibre
damage.