How to adjust color-changing ink without color-changing powder

1. Use temperature-sensitive pigments or heat-sensitive pigments. This pigment itself can show different colors with the change of temperature, and can be directly used as one of the components of ink.

2. Add toner. On the basis of basic ink, the color of ink is adjusted by adding toner. Commonly used toners include pigment toners, dye toners and pigment mixtures.

3. Adjust the ink formula. Adjusting the composition and proportion of ink and adding other pigments on the basis of red, yellow and blue pigments can make ink appear different colors at different temperatures.