Leuco dyes applied in thermal medical film

There are two main heat-sensitive components in the coating layer of heat-sensitive materials: one is leuco dye, the other is color developer. This thermosensitive material is also known as a two-group chemical type thermographic material.There are two kinds of leuco dyes applied into Thermal Medical Film. CAS RN:21934-68-9 and CAS RN:132467-74-4.When the thermal paper encounters the heat-generating print head, the color developer and the leuco dye at the print head will undergo a chemical reaction to change color, and the image will become a graphic.