TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The natural dye is carthami flos xanthophyll, Lac color, indigo dye, red cabbage pigment, Gardenia red pigment, Gardenia blue pigment, Gardenia yellow pigment, cacao pigment, cochineal, henna or Monascus red pigment. The pH modifier of carthami flos xanthophyll, Lac color, indigo dye, red cabbage pigment, Gardenia red pigment, Gardenia yellow pigment, cacao pigment, cochineal, henna or Monascus red pigment comprises acetic acid, hydrochloric acid, nitric acid, sulfuric acid, citric acid or auric acid, which controls a pH value of 1-6.7. The pH modifier of Gardenia blue pigment comprises ammonia, sodium hydroxide or potassium hydroxide, which controls a pH value of 8-12. The pH modifier adjusts the absorption wavelength range. The metal oxide particles comprise titanium oxide, tin oxide, tungsten oxide, zinc oxide, zirconium oxide, strontium oxide, and/or niobium oxide. Preferred Method: The absorption of the natural dye on the surface of metal oxide particles is carried out by the prepared natural dye solution having different absorption wavelengths which transmits specific wavelength for wavelength selection; and impregnating the lower substrate in the natural dye solution having different absorption wavelength.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent of Carthami Flos xanthophyll, Lac color, red cabbage pigment, Gardenia red pigment, Gardenia yellow pigment, cochineal or Monascus red pigment, includes water, methanol, ethanol, acetone, acetyl acetone, ethyl ethane, isopropyl alcohol or their mixture. The solvent of cacao, Gardenia blue pigment, henna or indigo dye includes water, ethanol, dimethyl sulfoxide, N-methylpyrrolidone, pyridine or their mixture. EXAMPLE - 0.2 g each of carthami flos xanthophyll, Lac color, indigo dye, red cabbage pigment, Gardenia yellow pigment, cacao pigment, cochineal and henna were respectively dissolved in 20 ml ethanol and then magnetically stirred for 30 minutes to obtain the natural dye solution.