We recently had our SQF audit and passed with our only NC being that the auditor found a non-food grade chemical in our food-grade chemical closet. I'm starting the CAPA process for final resolution of this NC and wanted to create and laminate a sign at the food-grade closet defining how to determine if something is food-grade.
From my understanding, it seems the primary ways to identify this are if the product has "Food Grade" designation or has an "NSF" declaration on the product. Is this assumption correct? Are there other methods of identifying an item's Food Grade designation? Due to the importance of this topic it seems like there should be a standardized document on this subject, though so far I haven't been able to find one.