The parboiling is the hydrothermal treatment of paddy before processing. The objective of this study was to evaluate the influence of the temperature and immersion time step of soaking (independent variables) on the color of the grain parboiled (dependent variable) cultivars of upland rice (BRS Primavera and BRS Sertaneja). A central composite rotational design (DCCR) was used, which includes a 22 full factori...