Some perfume essences are diluted in order to reduce their cost. They are therefore sold at a cheaper price. Diluted perfume essences have a slight chemical smell (it is a petroleum product) and are very oily when applied onto the skin. However, a perfume essence blended with good carrier oils like jojoba oil or sweet almond oil should blend onto the skin once it is applied without leaving a greasy feel, and without leaking.

The best way to differentiate a perfume essence blended with the right amount and good quality carrier oil from one diluted with too much and low quality carrier oil is to apply both types on your skin, and watch them dry: the good perfume essence will blend onto your natural body oil and disappear almost immediately without leaving a greasy feel, while the bad perfume essence will stay for a while, even leak on your skin, not disappearing until you rub it away. As a result, your skin is left feeling greasy.
An example of bad carrier oil is any mineral-based oils like Isopropyl myristate (IPM) and Dipropylene Glycol (DPG). They have a very poor power of absorption (by the skin) and therefore leave the skin feeling greasy. They also inhibit some aromas in the perfume essence.

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