Patent ID: 7829515

Claim:
Method of signaling that a defined temperature is obtained and that a benefit agent is released which method comprises (1) preparing a solid bar composition comprising: (a) 5 to 85% by wt. of a surfactant selected from the group consisting of anionic surfactant, nonionic surfactant, amphoteric surfactant, cationic surfactant and mixtures thereof; (b) 1 to 50% by wt. bar structurant; (c) 0 to 30% by wt. free fatty acid; (d) 0.1 to 10% by wt. thermochromatic pigment or dye; and (e) 1 to 25% benefit agent; wherein the process of preparing said bar comprises combining separate chip compositions comprising: (i) 5 to 40% by wt. pigment-containing chip composition comprising: (a) 40 to 99.9% by wt. chips comprising polyalkylene glycol soluble structurant material; (b) 1 to 40% by wt. chip comprising benefit agent; (c) 0.1 to 25% by wt. chip comprising thermochromatic pigment or dye; and (d) 0 to 10% by wt. chip comprising compositions water; and (ii) 95 to 60% by wt. chip composition comprising surfactant and which comprise substantially no thermochromatic pigment or a pigment of a different color from that in pigment-containing chip; wherein (i) and (ii) are combined to form said final solid bar composition in which the pigment is found in the final bar in concentrated regions ranging from 50 μm to 1 cm in its largest direction defined by the chips of (i) and which regions further define the delivery of said benefit agent in chips of (i); and (2) indicating a visual cue that said temperature is obtained and the benefit agent is released.