Discussions about the effect of climatic influences during storage and transport and in the process of printing and finishing, are as old as the industrial production of paper itself. Generations of experts have had to deal with the more pronounced negative effects and there are numerous publications in the field of specialist literature on measuring temperature and humidity. So it is not as if experience is lacking on the subject. Still, many of the relations have not yet been sufficiently explained. And in some cases, cause and effect remain completely obscure. In the practice of paper processing, many delusions and misunderstandings still exist, particularly with respect to the interaction between climate, paper and printing.