I was wondering if a cure can lose its potency? I have some Fast Cure made by Reichert Spice Co. Ingredients are as follows: salt 6.25% sodium nitrite 17 ppm red #3 and less than 1.0% glycerine. Directions say use 4oz of cure to ea h 100 lbs of meat. When I used it the meat didn't get as red as the meat I have curing with TC.