The fact that fragrances are produced in various concentrations has already been described many times, for example here: https://www.leparfumlechic.sk/strucny-navod/.
The stated concentration values are rather indicative, in practice, they sometimes overlap, because different ingredients have different characteristics and sometimes behave differently in different concentrations – after all, that’s one of the reasons why some perfumes have a slightly modified composition for different concentrations.
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