Fig. 3. Pumpkin fortified with iron (Fe) and ascorbic acid (AA) by dry infusion and air
dried: surface response and the best fitted second degree polynomial for
Chroma ¼ (a*2 þ b*2)(1/2): Chroma ¼ 40.26e1.663 AA 105.59 Fe þ 0.0605
AA2 þ 237.74 Fe2 (R2 ¼ 0.755, lack of fit p ¼ 0.119).