Flower essences contain flower infused water and brandy. Every time I have bought and used dropper bottles from Premium Vials - the brandy alcohol evaporates - making the essences unusable after a few months. I've lost customers and money due to this problem. This is the only company that has this problem of faulty rubber stoppers on their bottles. Customer service was no help. It seems from the reviews on this site that many others are also experiencing problems with this company.