The authors have studied the bleaching of wool with hydrogen peroxide since 1965 (see also AATA 8-1791. 12-912, and 20-511) Their treatise is divided into the following sections: hydrogen peroxide, mechanism of decomposition; action of hydrogen peroxide on wool; characterization of hydrogen bleached wool-physical parameters, chemical parameters, various parameters; bleaching process variables; bleaching conditions; bleaching methods; methods of bleaching in long liquors; pad-store methods of bleaching. -- AATA