Predicting the Stability of Double Fortified Salt by Determining the Coating Quality of the Encapsulated Iron Premix

Figure 8

Qualitative iron test after 1 and 10 minutes of addition of phenanthroline colour reagent on Indian premixes 1–3, UofT positive control 4, and uncoated extruded ferrous fumarate. The intense red-orange colour formation of Premix-3 indicates the poor quality of the coating.