CLP For Essential Oil Candles - Home Scentify CLP applies to any size non-cosmetic product containing a hazardous substance such as fragrance or essential oils (e.g., candles, wax melts, room sprays, reed diffusers etc). These products are subject to CLP simply because most fragrance oils and essential oils are deemed harmful in their natural state (i.e., 100 percent oil) in some way.