Patent ID: 8148312

Claim:
A method of treating a substrate comprising the steps of: i. contacting a substrate with an aqueous bleaching solution comprising: a source of oxidant; and a suspended polymer matrix, the suspended polymer matrix comprising: one or more copolymers; and a plurality of optically functional particles, comprising visibly colored particles exhibiting at least one optical absorbance band providing a human perceivable color and associated with the one or more copolymers, wherein the suspended polymer matrix forms a stable dispersion in the aqueous bleaching solution; wherein said one or more copolymers comprises at least one copolymer formed by polymerizing one or more hydrophobic monomers in combination with one or more hydrophilic monomers in the presence of the plurality of optically functional particles to form a single random suspended polymer matrix in the presence of the optically functional material dissolved in an organic solvent; ii. removing said aqueous bleaching solution from said substrate; and wherein said suspended polymer matrix provides an optical stability to said aqueous bleaching solution exhibiting less than 20 delta E units change after storage at 120° F. for 480 hours.