Looking up KNO3, it is Potassium Nitrate, also known as saltpeter. Sodium Nitrate is NaNo3. Ammonium Nitrate is NH4NO3. I don't believe they can be used for bluing, only the KNO3.

Sodium Nitrate is used in processed meats. This infomation is what I received when I typed in the various nitrates in Ask Jeeves- Ask.com


David