ABSTRACT
Inclassicalterms,preservationofacosmeticmeanttheadditionofachemicalthat hadnootherfunctionthantopreventmicrobialspoilage.Itgenerallyisagreedthat nosinglebiocideisan"idealpreservative"atcustomaryuselevels,andtwoor morepreservativesoftenarenecessaryforadequateprotectionofaformula.
