Color change of the osmotically dehydrated with CaCl_2 of purple sweet potatoes is shown in Figure 5. Overall a decreased trend of color continuously during storage under room temperature and a low temperature (4˚C). Lightness (L*) of the potatoes that were stored under low temperature was fluctuated throughout the storage (p≥0.05). On the other level, chroma and Hue (C*, H*) values of potatoes during storage decreased. Color of osmotically dehydrated purple sweet potatoes during storage was significantly differed among the different temperature storage.
Color change of osmotic dehydrated purple sweet potatoes that infused with CaCl2 has shown in Figure 6. Overall, a decreased trend of color was found in osmotic dehydrated purple sweet potatoes that infused with CaCl2. Lightness and chroma values of potatoes were tend to decreased while increasing the concentration of sucrose and CaCl2. The highest level of color (L*, C*) was dropped in samples which were treated with 60% sucrose and 4% CaCl2. On the other level, Hue (H°) values were not significantly differed among each other. However, the samples that were treated with 60% sucrose and 4% CaCl2 were slightly decreased the H° value as similar to other results of color.