| abstract |
Provided is a method for producing an ink in which a free radical generator is added to a natural dye to increase the fading speed of the natural dye. SOLUTION: A method for producing an ink in which the fading speed of a natural dye is increased by adding a free radical generator to the natural dye, wherein the free radical generator contains benzoyl peroxide, A method for producing an ink, wherein an oxidizing agent is added to a natural pigment to adjust a fading speed of the natural pigment, and the antioxidant contains tocopherol. [Selection] Figure 1 |