Pos/Neg Controls for Matrix Validation
GlutenTox Pro Controls consists of two powders in matching vials. The negative powder has been extensively tested and will always contain no detectable gluten. The positive powder will contain more than 40ppm gluten.
You can test the control materials for gluten just as you would any flour, powder, or fine crumb. Read our informative article on using Positive/Negative controls in your quality control plan.