Lavender 40/42 is made up of 100% natural lavender oils blended to produce oil containing 40% linalool and 42% linalyl acetate. Lavender 40/42 is usually a blend of various lavenders in order to get a consistent scent with processors adding linalyl acetate to cover the smell of camphor. Lavender 40/42 is more preferred than other lavender soaps because it smells the way they believe it should smell. It's also fairly inexpensive, about half the price of other, more expensive lavenders which are usually reserved for aromatherapy purposes. Blends well with almost any other essential oil. Endless blending options make it a very popular essential oil.