A year ago I got Mast E and Test E. Both oils were clear in color. I was relocating and decided to hold off before starting. Now today I checked the vials and The Test vials are still clear but Masteron E changed colors. It went from being transparent to a dark brown color. I've kept them in room temperature and away from light but also it tends to get a bit hot during the summer here even with AC running constantly. I've been reading around but have not found a solid explanation and answer. I know oxidation can cause changes but the vial was never opened before, it just sat on the shelf. So I'm wondering is the Mast E is any good to pin? Particularly if you were in a similar situation i'd like to hear your opinion. Here are some pics. Thanks