More moving to colored glass. I simply don't have room in my fridge for all of my flavors. Only the larger bottles I pull from stay refrigerated. Also for the dropper caps,
There have been several discussions on here over the last few years about dropper caps, (ones with the black plastic cap, glass dropper, and black rubber squeeze bulb). It's been said they are air permeable and that as the bulb degrades it lets even more air in. I don't use them myself because I mix by volume, so I have no personal experience with them. Just passing along what quite a few others have said. Might be something to look up and/or think about, especially for storage of flavorings in larger quantities that'll take awhile to use.