The Royal Apothecary Society needs your assistance.  Listen closely, and both of us may profit from my plan.$B$BApothecary Keever in the next room may be... touched... but his research does potentially bear fruit if it were pursued by a clever researcher.  Fortunately, I am such a researcher.  I want you to take this purchase order to Alessandro Luca, the proprietor of Blue Moon Odds and Ends; he'll give you a testing kit.  When you have it, bring it back to me and I'll outline your task in detail.