Compositions and methods for lightening the color of relaxed or straightened hair

A method of lightening the color of hair that has been recently contacted with a relaxing or straightening composition, the method comprising:

• (a) combining a bleach composition comprising at least one oxidizing agent selected from the group consisting of persulfates, perborates, percarbonates, their salts and mixtures thereof;
• and at least one rheology-modifying agent, with a developer composition comprising hydrogen peroxide and a cosmetically acceptable carrier in order to form a lightening composition, wherein the pH of the lightening composition is from about 2 to about 7;
• (b) applying the lightening composition onto hair that has been recently contacted with a relaxing or straightening composition;
• (c) leaving the lightening composition on the hair for a time period sufficient to achieve an increase of 1 to 4 in the tone height of the hair;
• and
• (d) optionally, rinsing the hair.