Essential Oils are extracted. Normally by the process of distillation from. Flower petals, bark, roots, seeds or the peel of fruit. A method of production that ensures they are amongst the purest and most natural products imaginable. Their strength and purity is such. That the correct inclusion rates are most often measured in small numbers of drops from a pipette per 500g of bait, rather than in milliliters. You will probably notice that prices vary somewhat from one essential oil to another. This has very little to do with the effectiveness and suitability for use in a carp bait. And much more to do with the purity and just how much raw material and time is required to produce a liter of oil. Where in the world the raw material originates from and how difficult the to extract also effects the cost.