Natural pigments and natural powder have high safety and pharmacological effects, so they have been used in the food field instead of tar-based synthetic pigments. However, natural pigments generally have the following characteristics. 

1. The color tone is unclear. Therefore, brightly colored soaps are not close to nature.

2. It has different taste and smell depending on coexisting ingredients. 

    Therefore, thorough quality control is required and the expiration date is important.

3. Light resistance and heat resistance are inferior. So the natural soap color fades over time.

4. It is hard to get high purity, and the coloring power is weak. So there is a color difference by each production lot.

5. It discolors under the influence of ph and metal ions. So the color of the natural soap may look different from the color of the natural powder.

6. The raw material supply is unstable because it is a natural product. Therefore, continuous mass production is hard to do.

7. The price is expensive. So the price of natural soap is higher than other soaps.