Hair Conditioning Composition Comprising Ammonium Thioglycolate and/or Ammonium Thiolactate

A hair straightening method comprising:

• (a) analysing hair health and/or hair type;
• (b) mixing together a conditioning formulation and a straightening formulation to form a hair conditioning composition;
• (c) applying the hair conditioning composition to hair;
• (d) allowing the hair conditioning composition to remain on the hair for a development time x;
• (e) rinsing and drying the hair;
• (f) mechanically straightening the hair using a temperature of from about 80° C. to about 250° C.;
• (g) applying a neutralising formulation to the hair;
• (h) rinsing the hair;
• wherein the hair conditioning composition comprises:
• from about 2.0% to about 9.0% reducing agent, by weight of the hair conditioning composition, wherein the reducing agent is selected from the group consisting of ammonium thioglycolate, ammonium thiolactate, and mixtures thereof;
• from about 0.5% to about 1.5% alkalising agent, by weight of the hair conditioning composition;
• from about 2.0% to about 10% conditioning agent, by weight of the hair conditioning composition, wherein the conditioning agent is selected from the group consisting of silicone compounds, cationic surfactants, and mixtures thereof;
• a buffering agent;
• wherein the composition has a pH of from about pH 7.5 to about pH 9.5;
• wherein the composition has a viscosity of from about 500 mPa·s to about 5500 mPa·s measured at 25° C.;
• wherein the composition is substantially free of an additional reducing agent capable of reducing disulfide bonds in keratin fibres.