In a nutshell,PAO stands for’period after opening’and indicates the length of time in which the product inside is safe and can be used after it has been opened for the very first time.Its graphic symbol,found on all types of cosmetic packaging,depicts an open cosmetics pot and is used together with a written number of months or years.However,different people have different ideas about what it means.Cosmetics manufacturers often get confused about whether they should use the PAO symbol (the open-jar image)or the’hourglass’icon,which indicates the date of minimum durability (DOMD),on their product labels.
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