One: Prepare a bowl of vinegar, just ordinary vinegar. Put in the capsule shell to be tested.
Two: Wait &; Wait, after about 5 minutes, the capsules will begin to deform. 15 minutes later, one of them has begun to release white powder.
Three: the moment to witness the miracle-after 20 minutes, the normal capsule will be broken by hand, and the poison capsule will not be broken by friction! After 30 minutes, the poison capsule is still unbreakable! ! !