Recently I started to experience extremine pain from my test prop even though it didn't start out that way.
I read a thread from a guy who said his prop developed crystals and he noticed pip just before he found them.
To solve his problem he boiled a pot of water turned off the heat then placed the vial of prop in the water. Also put a needle in the top to allow moisture to escape. Even though I couldn't see any crystals I did the same to dissolve any micro crystals.
Sure enough it worked. No more Pain