I was asked today whether I knew how to extract essential oils from various plants, which was a stupid question because any potion maker worth their salt knows how to process raw ingredients to obtain the particular form or quality they wish when it is not available any other way. This caused a great deal of excitement among a three of my colleagues and not a small amount of importuning on their part. Since they're not completely useless, I have agreed. It's hardly difficult and I do find it a pleasant diversion when more complex brewing is frustrating me.