Essence is a raw material that gives hydrogel patches a certain aroma. It is one of the key raw materials in the manufacturing process. The proper selection of flavors is not only loved by consumers but also can cover some bad odors in the media.

Bright coloring, strong coloring, good stability, odorless, tasteless, uniform quality, easy to dissolve and mix color, and low cost.

Temperature sensitive pigments are prepared by electron transfer organic compound system.Electron transfer organic compounds are a kind of organic Chromogenic System with special chemical structureDue to electron transfer at certain temperature, the molecular structure of the organic matter changes, so that the color change can be realized. The color change material is not only bright color, but also can realize color change from "colourless = = = = colorless" state, which is not possessed by heavy metal complex salt complex and liquid crystalline reversible thermo chromophore