interesting..i will send my sample for GC analysis and will confirm the compound in there and hopefully it will contain chamazulene that contribute to blue colour of the essential oil. Thank you so much.@Noel W Davies
Hydrolysis of esters to alcohols and acids may occur during steam distillation. This will have serious implications in case of ester rich oils and special precaution have to be taken to prevent or at least limit the extent of ester degradation. It is common in Lavender. And Yess, I agree with the above comments on Chamazulene, because it is an unstable compound can be responsible for change in colour.