DYE IN CHEMICAL TEMPERATURE INDICATING DEVICE

摘要

DYE IN CHEMICAL TEMPERATURE INDICATING DEVICE There is provided a temperature indicating device such as a disposable thermometer. The thermometer includes a thermally conductive sheet as a carrier layer having one or more cavities formed by depressions in the sheet material. At least one of the cavities is filled with a solid mixture which melts at a predetermined temperature. The mixture includes the combination of ortho-chloronitrobenzene, ortho-bromonitrobenzene and a dyestuff. An indicator layer of absorbent material is superimposed on the solid mixture, and a transparent cover layer seals the cavities and their contents.