I finished a bottle of Test cypionate and had left it out for a week or so and not discarded it. Well the rubber stopper had been removed and it let air into the bottle where a little of the oil was left over inside. I just happen to look at the bottle last night and I see like a sugar like crust in the bottom that extends up the side a bit where it was lying down. Crystals? I put a pair of tweezers inside to try and grab at it. The crystals just mooshed and kinda went back into a oily solution. Anyone know what's up with that? If certain gear is exposed to te air for to long will it do this. I looked at a couple of different bottles I had left over and I did see it in another one that was open to the air. One brand was QV and the other was SYD Group. I had just never heard of gear oils exposed to air for awhile do they dry into crystals kinda like when water freezes to glass and you can see that spread of ice crystals along the glass.