A process for the preparation of an at least one supporting substrate, a pigment between layer and a thermal reaction layer, a thermometer comprising paper, wherein the pigment between the layer with an at least pigments and binders containing aqueous application suspension by means of the curtain coating process is formed, characterized in that a calcined kaolin aqueous application suspension having a solids content of 25 to 75 w -% by means of the curtain coating process in the case of an operating speed of at least 500 m / min is applied and dried.
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