ABSTRACT
The.mission.of.the.multibillion.dollar.personal.care.industry.is.to.raise.vitality.of.life,.to.help.us.get. more.out.of.life-emotionally.and.physically..The.personal.care.products.such.as.toothpaste,.soap,. shampoo,.cold.cream,.antiwrinkle.cream,.deodorant.spray,.lipstick,.nail.polish,.hair.colorants,.and. so.forth,.collectively.touch.every.spot.of.our.body.at.every.moment.of.our.life..They.take.care.of. our.hygiene,.protect.us.from.damage.by.ultraviolet.(UV).light.or.aggressive.climate,.and.restore. or.repair.damaged.body.surfaces..They.make.us.look.good.and.feel.good..The.majority.of.these. personal.care.products.are.not.pure.chemical.molecules.or.their.homogeneous.solutions..They.are. multiphase.composite.systems,.the.constituents.of.which.are.often.self-organized.into.a.myriad.of. multiscale.hierarchical.structures..The.nanoscale.features.or.entities.present.in.these.products.often. uniquely.control.or.contribute.to.their.physical.characteristics,.the.sensorial.experience.they.offer,. and.the.functional.interactions.they.have.with.the.body..The.body.substrates.with.which.these.products.interact.are.also.hierarchically.assembled,.multiorganelle,.multicellular.tissues,.with.nanoscale. features.and.entities.having.unique.characteristic.structural.or.functional.roles..No.wonder,.therefore,.that.understanding.the.emergence.of.novel.phenomena.at.nanoscale.in.products.and.body.substrates,.as.well.as.scouting.new.applications.of.nanoscience.and.nanomaterials.for.exploring.novel. benefits,.is.a.fascinating.topic.for.research.and.development.(R&D).in.the.personal.care.industry.. The.objective.of.this.short.chapter.is.to.introduce.this.exciting.subject.with.a.few.illustrations,.primarily.in.the.area.of.color.management.
