P = period (s)
A = after (after)
O = opening (aperture)
It 's the date that refers to the shelf life after first opening. The symbol is a circular open container with a number written in a supported M, for example, 12 M, ie opening the product, if properly stored, can be used up to 12 months, may well lose its effectiveness and the most extreme cases become irritating if not toxic!
addition to the PAO may be necessary to make an organoleptic test that you need to trust our senses, for example if you have to do with an oil or an oily product, the smell is the first warning bell for when an oil Ends takes the typical "smell" stale, as a cream emulsion can separate in two phases and / or change texture, etc.. .
Last but not least is good regardless of where and how products are preserved by traders:
- the sun is certainly not ideal
- essential oils should be stored in dark glass containers strictly
- the wrapper should be intact
- e the case of main bulk commodities (eg tea) be careful that there are no traces of insect intruders! :)
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