Principle 6: give priority to naturalness
The six principles of Green extraction of natural products

The concept of naturalness is rather difficult to define, particularly in the case of plant extracts where the definition of a truly natural extract is unclear. According to the REACH legislation , a natural substance is "a natural substance, as such, unprocessed or processed only by manual mechanical or gravitational means, by dissolution in water, by flotation, by extraction with water, by steam distillation or by heating solely to remove water, or which is extracted from air by any means". This definition includes that the substance must not be chemically...