Cleaning Method B suggests the application of hydrogen peroxide followed by household ammonia. The use of hydrogen peroxide alone for food dye stains is often sufficient. By immediately adding ammonia you raise the pH of hydrogen peroxide, which dramatically accelerates the bleaching process. Hydrogen peroxide contains approximately 0.001% phosphoric acid for the very purpose of slowing down the bleaching process. Finally, hydrogen peroxide in itself ages very rapidly (which explains the need for the brown bottle) Shelf life for spot cleaning purposes is only 3 to 6 months. It is suggested that you use a hydrogen peroxide/ammonia solution only on white and off white colors.