State-of-the-Art Glass Bottles Every time you open an essential oil, you are releasing nature into the air. To make sure you get to enjoy every drop, we've developed state-of-the-art leak-proof caps. Our high-quality, dark amber glass bottles increase the longevity of essential oils by reducing oxidation. GC/MS testing enables us to analyze purity so that we can provide you with 100% pure and natural essential oils. You can view the official GC/MS report by simply scanning the QR code. GuruNanda includes a gorgeous magnetic box and an informative recipe book to get you up and running right away. Our magnetic box enables you to make your collection portable while the recipe book gets you started with some DIY essential oil ideas.