A thickening formulation comprising: an oxidising agent, and an associative thickening polymer capable of interacting with a hydrophobic phase and a hydrophilic phase； and wherein the associative thickening polymer comprises hydrophobic moieties and hydrophilic moieties； and wherein the thickening formulation comprises at least 1.2% of associative thickening polymer； and wherein the thickening formulation comprises from 1 % to 12% of an oxidising agent.
