Patent ID: 8541154

Claim:
A toner composition comprising toner particles formed by an emulsion/aggregation process, wherein the toner particles have a core portion and a shell portion, and comprise: an unsaturated polymeric resin; an optional colorant; an optional wax; an optional coagulant; and a fluorescent nanoparticle composition comprising a crystalline benzothioxanthene pigment particle; wherein the crystalline benzothioxanthene pigment particle has an average particle length of less than about 150 nm, and average particle width of less than about 30 nm, the crystalline benzothioxanthene pigment particle comprising: a benzothioxanthene pigment having at least one functional moiety, and at least one sterically bulky stabilizer compound each having at least one functional group, wherein the functional moiety on the benzothioxanthene pigment associates non-covalently with the functional group of the stabilizer.