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Standard Classifications for ratio of perfume oils to base product:

Eau de Cologne (EDC) at 2 - 5%
is the least concentrated

Lavender essential oil

Eau de Toilette (EDT) at 4 - 10%
Eau de Parfum (EDP) at 8 - 15%
Perfume (PARFUM) at 15 - 25%
is the most concentrated

Rosemary essential oil

Notice: Consult with your physician or aromatherapeutic reference for any questions regarding the use of essential oils. As with any cologne product keep away from children, fire, flame and heat.