How to make "pigskin jelly" is clear, bright and delicious?

Let me teach you a method. My dad taught others to use it. If the cooked pigskin frozen soup is turbid, pour the blood of frozen meat in the refrigerator on it and the floating soup will become clear! Honey, you can try. Very useful! I never use freeze-dried powder and alum to do this at home! Then put less soy sauce!