Does it list ingredients and %?
Per FDA and USDA regulations.
Prague Powder #1 Contains 6.25% sodium nitrite and 93.75% sodium chloride
Prague Powder #2 Contains 6.25% sodium nitrite, 4% sodium nitrate and 89.75% sodium chloride
Prague powder #2 should never be used on any product that will be fried at high temperature (eg.bacon) because of the resulting formation of nitrosamines.