One of the unsung heroes of essential oil use are Katja Svoboda and her team at the Scottish Agricultural College for their research into essential oils and blends of oils for therapeutic effect. Katje's research focussed on utilising the antibacterial and antifungal properties of essential oils to preserve crops and food naturally, an important essential oil use.
Rosemary Caddy used this research to produce her excellent aromatherapy teaching materials. She knew as an educational researcher that students responded better to learning in clour and the result is the caddy profile cards and materials. http://www.ccprofiles.co.uk/