AHA!!! I may be on to something. I got this from MMS's site:
I need to explain that cyclomethicone is NOT the perfect solution. It isn’t compatible with all fragrance oils, so testing is required. But, testing is simple and quick.
I’m going to explain how to test with cyclomethicone and then we will make a Monsters Away spray for kids.
Testing Cyclomethicone and Fragrance Oil compatibility:
Using clear dram vials, put 1 mL of cyclomethicone into the vial. Add 1 drop of fragrance oil. Watch the oil settle to the bottom, float on top, or disperse. It is important to watch the drop because not all fragrance oils have a color. It is very hard to see fragrance oils that are colorless, so watch carefully. Once you have determined where the drop went, cap and shake the bottle. Did the drop return to the bottom? Is it still floating on top? Is it completely mixed in?
We want a completely mixed in product. If you aren’t sure, and sometimes it is hard to tell, leave the bottle overnight and recheck it in the morning. Oils which are not compatible will remain separated from the cyclomethicone. Oils that are compatible will be completely mixed into the cyclomethicone.I might just have tried an "incompatible" FO! Back to the laboratory! <insert mad scientist laugh here>