Modern dry toner production colour presses can produce good print quality on a much wider substrate selection than what has been possible earlier. Because of the use of indirect or single pass toner transfer processes, which enables imaging on a known intermediate substrate with optimized electrical properties and/or only one transfer to paper, these systems are clearly more robust against the macro electrical properties of paper than the machines transferring directly from the photoconductor to the paper. This is a clear development from the copy shop machines utilizing four consecutive toner transfers directly onto the paper sheet. So, with the modern dry toner colour presses the emphasis, what comes to print quality, is more on surface evenness and good uniformity, than on the macro-scale electrical properties. This brings out also the print quality and related business advantages that can be attained with coated papers, like in offset printing.