Results from the crumb colour parameters are presented in Table 4. The L*, a* and b* values for crumb colour showed significant (P < 0.05) differences among the different protein enriched muffins. Lightness of muffin crumb was significantly (P < 0.05) decreased by VWG, SPI, PPI and C proteins; while the EWP addition increased L* value. The lowest L* was obtained for PPI containing muffin, which was due to the darker colour of the protein isolate (data no showed). Consequently, the L* values can be associated to the original colour of both rice flour and protein isolates.