Prague Powder #1 aka Insta Cure #1, pink curing salt, or Sel Rose is composed of 6.75% Sodium Nitrite and 93.25% Sodium Chloride. It used in the curing process to prevent botulism poisoning and to provide the characteristic flavor and red color associated with curing. Prague Powder #1 is recommended for meats that require short cures and will be cooked and eaten relatively quickly, like sausages. It is not appropriate for long cured products like hard salami.
Recommended usage for curing is 1.1g per 500g of meat.