Determination of obscuration. Part I. Evaluation of the dry extract method

Abstract

The obscuration values obtained using the AOAC dry residue method were compared with theoretical values and the limits of applicability of the AOAC factor were calculated. It is recommended that obscuration be expressed as the difference in density rather than in strength and that a corresponding density factor be used in place of the strength factor when applying the dry extract method. The scope of invariability of the density factor is significantly larger than that of the common strength factor.