4 Common Types of Essential Oils – Essential-Oil.com

Great overview of how the most common types of essential oils are made - 

Essential oils are differentiated or grouped by their extraction methods. Nowadays different methods are used in extraction, but the most common and prevalent methods are: Steam Distillation, Cold Pressing and Solvent Extraction. Based on these methods, essential oils can be classified into four different types: 1.Steam-distilled, 2. Expressed, 3. Solvent-extracted and 4. Absolutes or concretes.

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