For the appearance of the soy donut, surface color (yellow to brown), surface texture (smooth to rough), shine (dull to shiny), and oiliness (dry to glossy) were evaluated on a ึึ7 point rating scale based on the following definition: Color was evaluated the surface color of donut, surface texture was the amount of irregularity, protrusions, grains, or bumps, surface shine was the amount of light reflected from the product's surface, and surface oiliness was the amount of oil on the surface.