Most of you are probably finding that you have suddenly developed a need for tiny bottles to hold your blends, dilution, and concoctions-- and for sharing oils with friends and family as they start asking questions about this weird new hobby of yours.I'm almost out of my handful of 5ml bottles that I first ordered. These littlest bottles seem to be the ones that I use the most. Most EO dealers use amber glass bottles, which have been the traditional color in aromatherapy (and in medicine in general) for ages. However, one EO source uses something I've not seen before-- a dark blue, indigo-colored (almost black) glass that apparently blocks the wavelengths of light that are harmful to essential oils (and other "living" substances) while permitting the beneficial ones to enter. I'm no expert on this, but I think it's fascinating. Here's the link he gives on why he uses this particular source of glass-- there is only one company worldwide producing this stuff. And here's another page from a natural living website about the glass, with some pretty wild pictures and information about its ability to preserve fresh foods. This is what made my jaw drop a bit... I'm looking into what it would cost to buy these rather than the typical 5ml bottles. Right now it looks like I'd have to buy them by the case of 224 to get some. That's a bit more than I need!