Why Equilibrium Curing (EQ) Beats Traditional Box Curing
Traditional bacon recipes use excess salt and tell you to "rinse after 7 days". If you leave the slab in for 8 days, it becomes unpalatably salty and inedible. Equilibrium Curing (EQ) measures the exact percentage of salt and nitrite the meat needs to reach osmotic equilibrium.
You place the meat and weighed cure into a vacuum-seal bag. Once the meat absorbs all the salt in the bag, it physically CANNOT become any saltier, whether you leave it for 8 days or 28 days!
The USDA 156 PPM Sodium Nitrite Formula
Prague Powder #1 (also called InstaCure #1 or pink curing salt) consists of 6.25% sodium nitrite and 93.75% table salt. The USDA maximum limit for dry-cured bacon is 156 parts per million (PPM) of sodium nitrite:
Because Prague Powder #1 is 93.75% salt, our calculator automatically subtracts the salt already inside the pink powder from your pure kosher salt addition.
Calculating Fridge Curing Time
Salt and nitrite penetrate meat at a rate of approximately 1/4 inch per day plus 2 safety buffer days. A 1.75-inch thick belly needs at least: ((1.75 imes 4) + 2 = mathbf{9 ext{ days}}) in the refrigerator at 36°F to 40°F, flipping the bag once daily.