Hair treatments

Claimed is an alkaline colour removal composition comprising: a) formamidine sulfinic acid (thiourea dioxide); b) an inert hydrophobic liquid; c) urea; and d) a sulfur containing nucleophile. Most preferably, the inert hydrophobic liquid is liquid paraffin. Most preferably, the sulfur containing nucleophile is thioglycolic acid. Preferably, the composition has a pH of 9 to 10. Also claimed is a kit of parts wherein components a) and b) form a first precursor and c) and d) form a second precursor. Further claimed is a method of removing color from dyed hair (i.e. a keratin fibre) wherein components A)-D) are mixed; the composition comprising A)-D) is contacted with the hair; subsequently, an oxidizing composition (e.g. hydrogen peroxide) is added to the hair. Inventive concept is the inclusion of paraffin liquid into a hair decolouring composition comprising formamidine sulphinic acid, urea and sulfur containing nucleophile.