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Blue4est® is the innovative thermal paper from Koehler. It is guaranteed to be free of chemical developers and can easily be used in any
conventional thermal printer. Instead of a chemical reaction to heat, the emergence of text on our new Blue4est® thermal paper is a purely physical reaction. The paper’s opaque functional layer turns transparent due to the effects of heat, and the black layer beneath it is revealed. Optionally, Blue4est® Pro features an additional protective layer that protects the paper from mechanical damage for use as label stock.